CHANGELOG.txt

Drupal 7.53, xxxx-xx-xx (development version)
-----------------------

- Modules are now able to define theme engines.
- Numerous bug fixes.
- Fixed drag and drop support on newer Chrome/IE 11+ versions after 7.51 update
  when jQuery is updated to 1.7-1.11.0.

Drupal 7.52, 2016-11-16
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2016-005.

Drupal 7.51, 2016-10-05
-----------------------
- The Update module now also checks for updates to a disabled theme that is
  used as an admin theme.
- Exceptions thrown in dblog_watchdog() are now caught and ignored.
- Clarified the warning that appears when modules are missing or have moved.
- Log messages are now XSS filtered on display.
- Draggable tables now work on touch screen devices.
- Added a setting for allowing double underscores in CSS identifiers
  (https://www.drupal.org/node/2810369).
- If a user navigates away from a page while an Ajax request is running they
  will no longer get an error message saying "An Ajax HTTP request terminated
  abnormally".
- The system_region_list() API function now takes an optional third parameter
  which allows region name translations to be skipped when they are not needed
  (API addition: https://www.drupal.org/node/2810365).
- Numerous performance improvements.
- Numerous bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.50, 2016-07-07 
-----------------------
- Added a new "administer fields" permission for trusted users, which is
  required in addition to other permissions to use the field UI
  (https://www.drupal.org/node/2483307).
- Added clickjacking protection to Drupal core by setting the X-Frame-Options
  header to SAMEORIGIN by default (https://www.drupal.org/node/2735873).
- Added support for full UTF-8 (emojis, Asian symbols, mathematical symbols) on
  MySQL and other database drivers when the site and database are configured to
  allow it (https://www.drupal.org/node/2761183).
- Improved performance by avoiding a re-scan of directories when a file is
  missing; instead, trigger a PHP warning (minor API change:
  https://www.drupal.org/node/2581445).
- Made it possible to use any PHP callable in Ajax form callbacks, form API
  form-building functions, and form API wrapper callbacks (API addition:
  https://www.drupal.org/node/2761169).
- Fixed that following a password reset link while logged in leaves users unable
  to change their password (minor user interface change:
  https://www.drupal.org/node/2759023).
- Implemented various fixes for automated test failures on PHP 5.4+ and PHP 7.
  Drupal core automated tests now pass in these environments.
- Improved support for PHP 7 by fixing various problems.
- Fixed various bugs with PHP 5.5+ imagerotate(), including when incorrect
  color indices are passed in.
- Fixed a regression introduced in Drupal 7.43 that allowed files uploaded by
  anonymous users to be lost after form validation errors, and that also caused
  regressions with certain contributed modules.
- Fixed a regression introduced in Drupal 7.36 which caused the default value
  of hidden textarea fields to be ignored.
- Fixed robots.txt to allow search engines to access CSS, JavaScript and image
  files.
- Changed wording on the Update Manager settings page to clarify that the
  option to check for disabled module updates also applies to uninstalled
  modules (administrative-facing translatable string change).
- Changed the help text when editing menu links and configuring URL redirect
  actions so that it does not reference "Drupal" or the drupal.org website
  (administrative-facing translatable string change).
- Fixed the locale safety check that is used to ensure that translations are
  safe to allow for tokens in the href/src attributes of translated strings.
- Fixed that URL generation only works on port 80 when using domain based
  language negotation.
- Made method="get" forms work inside the administrative overlay. The fix adds
  a new hidden field to these forms when they appear inside the overlay (minor
  data structure change).
- Increased maxlength of menu link title input fields in the node form and
  menu link form from 128 to 255 characters.
- Removed meaningless post-check=0 and pre-check=0 cache control headers from
  Drupal HTTP responses.
- Added a .editorconfig file to auto-configure editors that support it.
- Added --directory option to run-tests.sh for easier test discovery of all
  tests within a project.
- Made run-tests.sh exit with a failure code when there are test fails or
  problems running the script.
- Fixed that cookies from previous tests are still present when a new test
  starts in DrupalWebTestCase.
- Improved performance of queries on the {authmap} database table.
- Fixed handling of missing files and functions inside the registry.
- Fixed Ajax handling for tableselect form elements that use checkboxes.
- Fixed a bug which caused ip_address() to return nothing when the client IP
  address and proxy IP address are the same.
- Added a new option to format_xml_elements() to allow for already encoded
  values.
- Changed the {history} table's node ID field to be an unsigned integer, to
  match the same field in the {node} table and to prevent errors with very
  large node IDs.
- Added an explicit page callback to the "admin/people/create" menu item in the
  User module (minor data structure change). Previously this automatically
  inherited the page callback from the parent "admin/people" menu item, which
  broke contributed modules that override the "admin/people" page.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.44, 2016-06-15
-----------------------
- Fixed security issues (privilege escalation). See SA-CORE-2016-002.

Drupal 7.43, 2016-02-24
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2016-001.

Drupal 7.42, 2016-02-03
-----------------------
- Stopped invoking hook_flush_caches() on every cron run, since some modules
  use that hook for expensive operations that are only needed on cache clears.
- Changed the default .htaccess and web.config to block Composer-related files.
- Added static caching to module_load_include() to improve performance.
- Fixed double-encoding bugs in select field widgets provided by the Options
  module. The fix deprecates the 'strip_tags' property on option widgets and
  replaces it with a new 'strip_tags_and_unescape' property (minor data
  structure change).
- Improved MySQL 5.7 support by changing the MySQL database driver to stop
  using the ANSI SQL mode alias, which has different meanings for different
  MySQL versions.
- Fixed a regression introduced in Drupal 7.39 which prevented autocomplete
  functionality from working on servers that are not configured to
  automatically recognize index.php.
- Updated the Archive_Tar PEAR package to the latest 1.4.0 release, to fix bugs
  with tar file handling on various operating systems.
- Fixed fatal errors on node preview when a field is displayed in the node
  teaser but hidden in the full node view. The fix removes a
  field_attach_prepare_view() call from the node_preview() function since it is
  redundant with one in the node preview theme layer.
- Improved the description of the "Trimmed" format option on text fields
  (translatable string change, and minor UI and data structure change).
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.41, 2015-10-21
-----------------------
- Fixed security issues (open redirect). See SA-CORE-2015-004.

Drupal 7.40, 2015-10-14
-----------------------
- Made Drupal's code for parsing .info files run much faster and use much less
  memory.
- Prevented drupal_http_request() from returning an error when it receives a
  201 through 206 HTTP status code.
- Added support for autoloading traits via the registry on sites running PHP
  5.4 or higher.
- Allowed the user-picture.tpl.php theme template to have HTML classes besides
  the default "user-picture" class printed in it (markup change).
- Fixed the URL text filter to convert e-mail addresses with plus signs into
  mailto: links.
- Added alternate text to file icons displayed by the File module, to improve
  accessibility (string change, and minor API addition to theme_file_icon()).
- Changed one-time login link failure messages to be displayed as errors or
  warnings as appropriate, rather than as regular status messages (minor UI
  change and data structure change).
- Changed the default settings.php configuration to exclude private files from
  the "404_fast_paths" behavior.
- Changed the page that displays filter tips for a particular text format, for
  example filter/tips/full_html, to return "page not found" or "access denied"
  if the format does not exist or the user does not have access to it. This
  change adds a new menu item to the Filter module's hook_menu() entry (minor
  data structure change).
- Added a new hook, hook_block_cid_parts_alter(), to allow modules to alter the
  cache keys used for caching a particular block.
- Made drupal_set_message() display and return messages when "0" is passed in
  as the message to set.
- Fixed non-functional "Files displayed by default" setting on file fields.
- The "worker callback" provided in hook_cron_queue_info() and the "finished"
  callback specified during batch processing can now be any PHP callable
  instead of just functions.
- Prevented drupal_set_time_limit() from decreasing the time limit in the case
  where the PHP maximum execution time is already unlimited.
- Changed the default thousand marker for numeric fields from a space ("1 000")
  to nothing ("1000") (minor UI change: https://www.drupal.org/node/1388376).
- Prevented malformed theme .info files (without a "name" key) from causing
  exceptions during menu rebuilds. If an .info file without a "name" key is
  found in a module or theme directory, Drupal will now use the module or
  theme's machine name as the display name instead.
- Made the format column in the {date_format_locale} database table
  case-sensitive, to match the equivalent column in the {date_formats} table.
- Fixed a bug in the Statistics module that caused JavaScript files attached to
  a node while it is being viewed to be omitted from the page.
- Added an optional 'project:' prefix that can be added to dependencies in a
  module's .info file to indicate which project the dependency resides in (API
  addition: https://www.drupal.org/node/2299747).
- Fixed various bugs that occurred after hooks were invoked early in the Drupal
  bootstrap and that caused module_implements() and drupal_alter() to cache an
  incomplete set of hook implementations for later use.
- Set the X-Content-Type-Options header to "nosniff" when possible, to prevent
  certain web browsers from picking an unsafe MIME type.
- Prevented the database API from executing multiple queries at once on MySQL,
  if the site's PHP version is new enough to do so. This is a secondary defense
  against SQL injection (API change: https://www.drupal.org/node/2463973).
- Fixed a bug in the Drupal 6 to Drupal 7 upgrade path which caused the upgrade
  to fail when there were multiple file records pointing to the same file.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.39, 2015-08-19
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2015-003.

Drupal 7.38, 2015-06-17
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2015-002.

Drupal 7.37, 2015-05-07
-----------------------
- Fixed a regression in Drupal 7.36 which caused certain kinds of content types
  to become disabled if they were defined by a no-longer-enabled module.
- Removed a confusing description regarding automatic time zone detection from
  the user account form (minor UI and data structure change).
- Allowed custom HTML tags with a dash in the name to pass through filter_xss()
  when specified in the list of allowed tags.
- Allowed hook_field_schema() implementations to specify indexes for fields
  based on a fixed-length column prefix (rather than the entire column), as was
  already allowed in hook_schema() implementations.
- Fixed PDO exceptions on PostgreSQL when accessing invalid entity URLs.
- Added a sites/all/libraries folder to the codebase, with instructions for
  using it.
- Added a description to the "Administer text formats and filters" permission
  on the Permissions page (string change).
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.36, 2015-04-01
-----------------------
- Added a 'file_public_schema' variable which allows modules that define
  publicly-accessible streams in hook_stream_wrappers() to bypass file download
  access checks when processing managed file upload fields.
- Fixed a bug that caused database query tags not to be added to search-related
  database queries under many circumstances, and which prevented the
  corresponding hook_query_TAG_alter() implementations from being called.
- Fixed the "for" attribute on managed file upload field labels to improve
  accessibility (minor markup change).
- Added a 'javascript_always_use_jquery' variable which can be set to FALSE by
  sites that may not need jQuery loaded on all pages, and a 'requires_jquery'
  option to drupal_add_js() which modules can set to FALSE when adding
  JavaScript files that have no dependency on jQuery (API addition:
  https://www.drupal.org/node/2462717).
- Fixed incorrect foreign keys in the User module's role_permission and
  users_roles database tables.
- Changed permission descriptions throughout Drupal core to consistently link
  to relevant administrative pages, regardless of whether the user viewing the
  Permissions page can view the page being linked to (minor UI change).
- Fixed the drupal_add_region_content() function so that it actually adds
  content to the page.
- Added an 'image_suppress_itok_output' variable to allow sites already using
  the existing 'image_allow_insecure_derivatives' variable to also prevent
  security tokens from appearing in image derivative URLs.
- Fixed double-escaping of theme names in the Block module administrative
  interface (minor string change).
- Added basic support for Xdebug when running automated tests.
- Fixed a bug which caused previewing a node to remove elements from the node
  being edited. With this fix, calling node_preview() will no longer modify the
  passed-in node object (minor API change).
- Added a user_has_role() function to check whether a user has a particular
  role (API addition: https://www.drupal.org/node/2462411).
- Fixed installation failures when an opcode cache is enabled.
- Fixed a bug in the Drupal 6 to Drupal 7 upgrade path which caused private
  files to be inaccessible.
- Fixed a bug in the Drupal 6 to Drupal 7 upgrade path which caused user
  pictures to be lost.
- Fixed missing language code in hook_field_attach_view_alter() when it is
  invoked from field_view_field().
- Stopped sending ETag and Last-Modified headers for uncached page requests,
  since they break caching for certain Varnish and Nginx configurations.
- Changed the Simpletest module to allow PSR-4 test classes to be used in
  Drupal 7.
- Fixed a fatal error that occurred when using the Comment module's "Unpublish
  comment containing keyword(s)" action.
- Changed the "lang" attribute on language links to "xml:lang" so it validates
  as XHTML (minor markup change).
- Prevented the form API from allowing arrays to be submitted for various form
  elements, such as textfields, textareas, and password fields (API change:
  https://www.drupal.org/node/2462723).
- Fixed a bug in the Contact module which caused the global user object to have
  the incorrect name and e-mail address during the remainder of the page
  request after the contact form is submitted.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.35, 2015-03-18
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2015-001.

Drupal 7.34, 2014-11-19
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2014-006.

Drupal 7.33, 2014-11-07
-----------------------
- Began storing the file modification time of each module and theme in the
  {system} database table so that contributed modules can use it to identify
  recently changed modules and themes (minor data structure change to the
  return value of system_get_info() and other related functions).
- Added a "Did you mean?" feature to the run-tests.sh script for running
  automated tests from the command line, to help developers who are attempting
  to run a particular test class or group.
- Changed the date format used in various HTTP headers output by Drupal core
  from RFC 1123 format to RFC 7231 format.
- Added a "block_cache_bypass_node_grants" variable to allow sites which have
  node access modules enabled to use the block cache if desired (API addition).
- Made image derivative generation HTTP requests return a 404 error (rather
  than a 500 error) when the source image does not exist.
- Fixed a bug which caused user pictures to be removed from the user object
  after saving, and resulted in data loss if the user account was subsequently
  re-saved.
- Fixed a bug in which field_has_data() did not return TRUE for fields that
  only had data in older entity revisions, leading to loss of the field's data
  when the field configuration was edited.
- Fixed a bug which caused the Ajax progress throbber to appear misaligned in
  many situatons (minor styling change).
- Prevented the Bartik theme from lower-casing the "Permalink" link on
  comments, for improved multilingual support (minor UI change).
- Added a "preferred_menu_links" tag to the database query that is used by
  menu_link_get_preferred() to find the preferred menu link for a given path,
  to make it easier to alter.
- Increased the maximum allowed length of block titles to 255 characters
  (database schema change to the {block} table).
- Removed the Field module's field_modules_uninstalled() function, since it did
  not do anything when it was invoked.
- Added a "theme_hook_original" variable to templates and theme functions and
  an optional sitewide theme debug mode, to provide contextual information in
  the page's HTML to theme developers. The theme debug mode is based on the one
  used with Twig in Drupal 8 and can be accessed by setting the "theme_debug"
  variable to TRUE (API addition).
- Added an entity_view_mode_prepare() API function to allow entity-defining
  modules to properly invoke hook_entity_view_mode_alter(), and used it
  throughout Drupal core to fix bugs with the invocation of that hook (API
  change: https://www.drupal.org/node/2369141).
- Security improvement: Made the database API's orderBy() method sanitize the
  sort direction ("ASC" or "DESC") for queries built with db_select(), so that
  calling code does not have to.
- Changed the RDF module to consistently output RDF metadata for nodes and
  comments near where the node is rendered in the HTML (minor markup and data
  structure change).
- Added an HTML class to RDFa metatags throughout Drupal to prevent them from
  accidentally affecting the site appearance (minor markup change).
- Fixed a bug in the Unicode requirements check which prevented installing
  Drupal on PHP 5.6.
- Fixed a bug which caused drupal_get_bootstrap_phase() to abort the bootstrap
  when called early in the page request.
- Renamed the "Search result" view mode to "Search result highlighting input"
  to better reflect how it is used (UI change).
- Improved database queries generated by EntityFieldQuery in the case where
  delta or language condition groups are used, to reduce the number of INNER
  JOINs (this is a minor data structure change affecting code which implements
  hook_query_alter() on these queries).
- Removed special-case behavior for file uploads which allowed user #1 to
  bypass maximum file size and user quota limits.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.32, 2014-10-15
-----------------------
- Fixed security issues (SQL injection). See SA-CORE-2014-005.

Drupal 7.31, 2014-08-06
-----------------------
- Fixed security issues (denial of service). See SA-CORE-2014-004.

Drupal 7.30, 2014-07-24
-----------------------
- Fixed a regression introduced in Drupal 7.29 that caused files or images
  attached to taxonomy terms to be deleted when the taxonomy term was edited
  and resaved (and other related bugs with contributed and custom modules).
- Added a warning on the permissions page to recommend restricting access to
  the "View site reports" permission to trusted administrators. See
  DRUPAL-PSA-2014-002.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.29, 2014-07-16
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2014-003.

Drupal 7.28, 2014-05-08
-----------------------
- Fixed a regression introduced in Drupal 7.27 that caused JavaScript to break
  on older browsers (such as Internet Explorer 8 and earlier) when Ajax was
  used.
- Increased the timeout used by the Update Manager module when it fetches data
  from drupal.org (from 5 seconds to 30 seconds), to work around a problem
  which causes incomplete information about security updates to be presented to
  site administrators. This fix may lead to a performance slowdown on the
  Update Manager administration pages, when installing Drupal distributions,
  and (for sites that use the automated cron feature) on occasional page loads
  by site visitors.
- Fixed the behavior of the token system's "[node:summary]" token when the body
  field does not have a manual summary.
- Changed the behavior of db_query_temporary() so that it works on SELECT
  queries even when they have leading comments/whitespace. A side effect of
  this fix is that db_query_temporary() will now fail with an error if it is
  ever used on non-SELECT queries.
- Added a "node_admin_filter" tag to the database query used to build the list
  of nodes on the content administration page, to make it easier to alter.
- Made the cron queue system log any exceptions that are thrown while an item
  in the queue is being processed, rather than stopping the entire PHP request.
- Improved screen reader support by adding an aria-live HTML attribute to file
  upload fields when there is an error uploading the file (minor markup
  change).
- Made the pager on the Tracker module listing pages show the same number of
  items as other pagers throughout Drupal core (minor UI change).
- Fixed a bug which caused caches not to be properly cleared when a file entity
  was saved or deleted.
- Added several missing countries to the default list returned by
  country_get_list() (string change).
- Replaced the term "weight" with "influence" in the content ranking settings
  for search, and added help text for administrators (string change).
- Fixed untranslatable text strings in the administrative interface for the
  "Crop" effect provided by the Image module (minor string change).
- Fixed a bug in the Taxonomy module update function introduced in Drupal 7.26
  that caused memory and CPU problems on sites with very large numbers of
  unpublished nodes.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.27, 2014-04-16
-----------------------
- Fixed security issues (information disclosure). See SA-CORE-2014-002.

Drupal 7.26, 2014-01-15
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2014-001.

Drupal 7.25, 2014-01-02
-----------------------
- Fixed a bug in node_save() which prevented the saved node from being updated
  in hook_node_insert() and other similar hooks.
- Added a meta tag to install.php to prevent it from being indexed by search
  engines even when Drupal is installed in a subfolder (minor markup change).
- Fixed a bug in the database API that caused frequent deadlock errors when
  running merge queries on some servers.
- Performance improvement: Prevented block rehashing from writing blocks to the
  database on every cache clear and cron run when the blocks have not changed.
  This fix results in an extra 'saved' key which is added and set to TRUE for
  each block returned by _block_rehash() that actually is saved to the database
  (data structure change).
- Added an optional 'skip on cron' parameter to hook_cron_queue_info() to allow
  queues to avoid being automatically processed on cron runs (API addition).
- Fixed a bug which caused hook_block_view_MODULE_DELTA_alter() to never be
  invoked if the block delta had a hyphen in it. To implement the hook when the
  block delta has a hyphen, modules should now replace hyphens with underscores
  when constructing the function name for the hook implementation.
- Fixed a bug which caused cached pages to sometimes be sent to the browser
  with incorrect compression. The fix adds a new 'page_compressed' key to the
  $cache->data array returned by drupal_page_get_cache() (minor data structure
  change).
- Fixed broken tests on PHP 5.5.
- Made the File and Image modules more robust when saving entities that have
  deleted files attached. The code in file_field_presave() will now remove the
  record of the deleted file from the entity before saving (minor data
  structure change).
- Standardized menu callback functions throughout Drupal core to return
  MENU_NOT_FOUND and MENU_ACCESS_DENIED rather than printing their own "page
  not found" or "access denied" pages (minor API change in the return value of
  these functions under some circumstances).
- Fixed a bug in which caches were not properly cleared when a node was deleted
  via the administrative interface.
- Changed the Bartik theme to render content contained in <pre>, <code> and
  similar tags in a larger font size, so it is easier to read.
- Fixed a bug in the Search module that caused exceptions to be thrown during
  searches if the server was not configured to represent decimal points as a
  period.
- Fixed a regression in the Image module that made image_style_url() not work
  when a relative path (rather than a complete file URI) was passed to it.
- Added an optional feature to the Statistics module to allow node views to be
  tracked by Ajax requests rather than during the server-side generation of the
  page. This allows the node counter to work on sites that use external page
  caches (string change and new administrative option:
  https://drupal.org/node/2164069).
- Added a link to the drupal.org documentation page for cron to the Cron
  settings page (string change).
- Added a 'drupal_anonymous_user_object' variable to allow the anonymous user
  object returned by drupal_anonymous_user() to be overridden with a classed
  object (API addition).
- Changed the database API to allow inserts based on a SELECT * query to work
  correctly.
- Changed the database schema of the {file_managed} table to allow Drupal to
  manage files larger than 4 GB.
- Changed the File module's hook_field_load() implementation to prevent file
  entity properties which have the same name as file or image field properties
  from overwriting the field properties (minor API change).
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.24, 2013-11-20
-----------------------
- Fixed security issues (multiple vulnerabilities), see SA-CORE-2013-003.

Drupal 7.23, 2013-08-07
-----------------------
- Fixed a fatal error on PostgreSQL databases when updating the Taxonomy module
  from Drupal 6 to Drupal 7.
- Fixed the default ordering of CSS files for sites using right-to-left
  languages, to consistently place the right-to-left override file immediately
  after the CSS it is overriding (API change: https://drupal.org/node/2058463).
- Added a drupal_check_memory_limit() API function to allow the memory limit to
  be checked consistently (API addition).
- Changed the default web.config file for IIS servers to allow favicon.ico
  files which are present in the filesystem to be accessed.
- Fixed inconsistent support for the 'tel' protocol in Drupal's URL filtering
  functions.
- Performance improvement: Allowed all hooks to be included in the
  module_implements() cache, even those that are only invoked on HTTP POST
  requests.
- Made the database system replace truncate queries with delete queries when
  inside a transaction, to fix issues with PostgreSQL and other databases.
- Fixed a bug which caused nested contextual links to display improperly.
- Fixed a bug which prevented cached image derivatives from being flushed for
  private files and other non-default file schemes.
- Fixed drupal_render() to always return an empty string when there is no
  output, rather than sometimes returning NULL (minor API change).
- Added protection to cache_clear_all() to ensure that non-cache tables cannot
  be truncated (API addition: a new isValidBin() method has been added to the
  default database cache implementation).
- Changed the default .htaccess file to support HTTP authorization in CGI
  environments.
- Changed the password reset form to pre-fill the username when requested via a
  URL query parameter, and used this in the error message that appears after a
  failed login attempt (minor data structure and behavior change).
- Fixed broken support for foreign keys in the field API.
- Fixed "No active batch" error when a user cancels their own account.
- Added a description to the "access content overview" permission on the
  permissions page (string change).
- Added a drupal_array_diff_assoc_recursive() function to allow associative
  arrays to be compared recursively (API addition).
- Added human-readable labels to image styles, in addition to the existing
  machine-readable name (API change: https://drupal.org/node/2058503).
- Moved the drupal_get_hash_salt() function to bootstrap.inc and used it in
  additional places in the code, for added security in the case where there is
  no hash salt in settings.php.
- Fixed a regression in Drupal 7.22 that caused internal server errors for
  sites running on very old Apache 1.x web servers.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.22, 2013-04-03
-----------------------
- Allowed the drupal_http_request() function to be overridden so that
  additional HTTP request capabilities can be added by contributed modules.
- Changed the Simpletest module to allow PSR-0 test classes to be used in
  Drupal 7.
- Removed an unnecessary "Content-Disposition" header from private file
  downloads; it prevented many private files from being viewed inline in a web
  browser.
- Changed various field API functions to allow them to optionally act on a
  single field within an entity (API addition: http://drupal.org/node/1825844).
- Fixed a bug which prevented Drupal's file transfer functionality from working
  on some PHP 5.4 systems.
- Fixed incorrect log message when theme() is called for a theme hook that does
  not exist (minor string change).
- Fixed Drupal's token-replacement system to allow spaces in the token value.
- Changed the default behavior after a user creates a node they do not have
  access to view. The user will now be redirected to the front page rather than
  an access denied page.
- Fixed a bug which prevented empty HTTP headers (such as "0") from being set.
  (Minor behavior change: Callers of drupal_add_http_header() must now set
  FALSE explicitly to prevent a header from being sent at all; this was already
  indicated in the function's documentation.)
- Fixed OpenID errors when more than one module implements hook_openid(). The
  behavior is now changed so that if more than one module tries to set the same
  parameter, the last module's change takes effect.
- Fixed a serious documentation bug: The $name variable in the
  taxonomy-term.tpl.php theme template was incorrectly documented as being
  sanitized when in fact it is not.
- Fixed a bug which prevented Drupal 6 to Drupal 7 upgrades on sites which had
  duplicate permission names in the User module's database tables.
- Added an empty "datatype" attribute to taxonomy term and username links to
  make the RDFa markup upward compatible with RDFa 1.1 (minor markup addition).
- Fixed a bug which caused the denial-of-service protection added in Drupal
  7.20 to break certain valid image URLs that had an extra slash in them.
- Fixed a bug with update queries in the SQLite database driver that prevented
  Drupal from being installed with SQLite on PHP 5.4.
- Fixed enforced dependencies errors updating to recent versions of Drupal 7 on
  certain non-MySQL databases.
- Refactored the Field module's caching behavior to obtain large improvements
  in memory usage for sites with many fields and instances (API addition:
  http://drupal.org/node/1915646).
- Fixed entity argument not being passed to implementations of
  hook_file_download_access_alter(). The fix adds an additional context
  parameter that can be passed when calling drupal_alter() for any hook (API
  change: http://drupal.org/node/1882722).
- Fixed broken support for translatable comment fields (API change:
  http://drupal.org/node/1874724).
- Added an assertThemeOutput() method to Simpletest to allow tests to check
  that themed output matches an expected HTML string (API addition).
- Added a link to "Install another module" after a module has been successfully
  downloaded via the Update Manager (UI change).
- Added an optional "exclusive" flag to installation profile .info files which
  allows Drupal distributions to force a profile to be selected during
  installation (API addition: http://drupal.org/node/1961012).
- Fixed a bug which caused the database API to not properly close database
  connections.
- Added a link to the URL for running cron from outside the site to the Cron
  settings page (UI change).
- Fixed a bug which prevented image styles from being reverted on PHP 5.4.
- Made the default .htaccess rules protocol sensitive to improve security for
  sites which use HTTPS and redirect between "www" and non-"www" versions of
  the page.
- Numerous small bug fixes.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.21, 2013-03-06
-----------------------
- Allowed sites using the 'image_allow_insecure_derivatives' variable to still
  have partial protection from the security issues fixed in Drupal 7.20.

Drupal 7.20, 2013-02-20
-----------------------
- Fixed security issues (denial of service). See SA-CORE-2013-002.

Drupal 7.19, 2013-01-16
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2013-001.

Drupal 7.18, 2012-12-19
-----------------------
- Fixed security issues (multiple vulnerabilities). See SA-CORE-2012-004.

Drupal 7.17, 2012-11-07
-----------------------
- Changed the default value of the '404_fast_html' variable to have a DOCTYPE
  declaration.
- Made it possible to use associative arrays for the 'items' variable in
  theme_item_list().
- Fixed a bug which prevented required form elements without a title from being
  given an "error" class when the form fails validation.
- Prevented duplicate HTML IDs from appearing when two forms are displayed on
  the same page and one of them is submitted with invalid data (minor markup
  change).
- Fixed a bug which prevented Drupal 6 to Drupal 7 upgrades on sites which had
  stale data in the Upload module's database tables.
- Fixed a bug in the States API which prevented certain types of form elements
  from being disabled when requested.
- Allowed aggregator feed items with author names longer than 255 characters to
  have a truncated version saved to the database (rather than causing a fatal
  error).
- Allowed aggregator feed items to have URLs longer than 255 characters
  (schema change which results in several columns in the Aggregator module's
  database tables changing from VARCHAR to TEXT fields).
- Added hook_taxonomy_term_view() and standardized the process for rendering
  taxonomy terms to invoke hook_entity_view() and otherwise make it consistent
  with other entities (API change: http://drupal.org/node/1808870).
- Added hook_entity_view_mode_alter() to allow modules to change entity view
  modes on display (API addition: http://drupal.org/node/1833086).
- Fixed a bug which made database queries running a "LIKE" query on blob fields
  fail on PostgreSQL databases. This caused errors during the Drupal 6 to
  Drupal 7 upgrade.
- Changed the hook_menu() entry for Drupal's rss.xml page to prevent extra path
  components from being accidentally passed to the page callback function (data
  structure change).
- Removed a non-standard "name" attribute from Drupal's default Content-Type
  header for file downloads.
- Fixed the theme settings form to properly clean up submitted values in
  $form_state['values'] when the form is submitted (data structure change).
- Fixed an inconsistency by removing the colon from the end of the label on
  multi-valued form fields (minor string change).
- Added support for 'weight' in hook_field_widget_info() to allow modules to
  control the order in which widgets are displayed in the Field UI.
- Updated various tables in the OpenID and Book modules to use the default
  "empty table" text pattern (string change).
- Added proxy server support to drupal_http_request().
- Added "lang" attributes to language links, to better support screen readers.
- Fixed double occurrence of a "ul" HTML tag on secondary local tasks in the
  Seven theme (markup change).
- Fixed bugs which caused taxonomy vocabulary and shortcut set titles to be
  double-escaped. The fix replaces the taxonomy vocabulary overview page and
  "Edit shortcuts" menu items' title callback entries in hook_menu() with new
  functions that do not escape HTML characters (data structure change).
- Modified the Update manager module to allow drupal.org to collect usage
  statistics for individual modules and themes, rather than only for entire
  projects.
- Modified the node listing database query on Drupal's default front page to
  add table aliases for better query altering (this is a data structure change
  affecting code which implements hook_query_alter() on this query).
- Improved the translatability of the "Field type(s) in use" message on the
  modules page (admin-facing string change).
- Fixed a regression which caused a "call to undefined function
  drupal_find_base_themes()" fatal error under rare circumstances.
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.16, 2012-10-17
-----------------------
- Fixed security issues (Arbitrary PHP code execution and information
  disclosure). See SA-CORE-2012-003.

Drupal 7.15, 2012-08-01
-----------------------
- Introduced a 'user_password_reset_timeout' variable to allow the 24-hour
  expiration for user password reset links to be adjusted (API addition).
- Fixed database errors due to ambiguous column names that occurred when
  EntityFieldQuery was used in certain situations.
- Changed the drupal_array_get_nested_value() function to return a reference
  (API addition).
- Changed the System module's hook_block_info() implementation to assign the
  "Main page content" and "System help" blocks to appropriate regions by
  default and prevent error messages on the block administration page (data
  structure change).
- Fixed regression: Non-node entities couldn't be accessed with
  EntityFieldQuery.
- Fixed regression: Optional radio buttons with an empty, non-NULL default
  value led to an illegal choice error when none were selected.
- Reorganized the testing framework to split setUp() into specific sub-methods
  and fix several regressions in the process.
- Fixed bug which made it impossible to search for strings that have not been
  translated into a particular language.
- Renamed the "Field" column on the Manage Fields screen to "Field type", since
  the former was confusing and inaccurate (UI change).
- Performance improvement: Removed needless call to system_rebuild_module_data()
  in field_sync_field_status(), greatly speeding up bulk module enable/disable.
- Fixed bug which prevented notifications from being sent when core, module, and
  theme updates are available.
- Fixed bug which prevented sub-themes from inheriting the default values of
  theme settings defined by the base theme.
- Fixed bug which prevented the jQuery UI Datepicker from being localized.
- Made Ajax alert dialogs respect error reporting settings.
- Fixed bug which prevented image styles from being deleted on PHP 5.4.
- Fixed bug: Language detection by domain only worked on port 80.
- Fixed regression: The first plural index on a page was not calculated
  correctly.
- Introduced generic entity language support. Entities may now declare their
  language property in hook_entity_info(), and modules working with entities
  may access the language using entity_language() (API change:
  http://drupal.org/node/1626346).
- Added EntityFieldQuery support for taxonomy bundles.
- Fixed issue where field form structure was incomplete if field_access()
  returned FALSE. Instead of being incomplete, the form structure now has
  #access set to FALSE and field form validation is skipped (data structure
  change: http://drupal.org/node/1663020).
- Fixed data loss issue due to field_has_data() returning inconsistent results.
  The fix adds an optional DANGEROUS_ACCESS_CHECK_OPT_OUT tag to entity field
  queries which field storage engines can respond to (API addition:
  http://drupal.org/node/1597378).
- Fixed notice: Undefined index: default_image in image_field_prepare_view()
- Numerous API documentation improvements.
- Additional automated test coverage.

Drupal 7.14, 2012-05-02
-----------------------
- Fixed "integrity constraint" fatal errors when rebuilding registry.
- Fixed custom logo and favicon functionality referencing incorrect paths.
- Fixed DB Case Sensitivity: Allow BINARY attribute in MySQL.
- Split field_bundle_settings out per bundle.
- Improve UX for machine names for fields (UI change).
- Fixed User pictures are not removed properly.
- Fixed HTTPS sessions not working in all cases.
- Fixed Regression: Required radios throw illegal choice error when none
  selected.
- Fixed allow autocompletion requests to include slashes.
- Eliminate $user->cache and {session}.cache in favor of
  $_SESSION['cache_expiration'][$bin] (Performance).
- Fixed focus jumps to tab when pressing enter on a form element within tab.
- Fixed race condition in locale() - duplicates in {locales_source}.
- Fixed Missing "Default image" per field instance.
- Quit clobbering people's work when they click the filter tips link
- Form API #states: Fix conditionals to allow OR and XOR constructions.
- Fixed Focus jumps to tab when pressing enter on a form element within tab.
  (Accessibility)
- Improved performance of node_access queries.
- Fixed Fieldsets inside vertical tabs have no title and can't be collapsed.
- Reduce size of cache_menu table (Performance).
- Fixed unnecessary aggregation of CSS/JS (Performance).
- Fixed taxonomy_autocomplete() produces SQL error for nonexistent field.
- Fixed HTML filter is not run first by default, despite default weight.
- Fixed Overlay does not work with prefixed URL paths.
- Better debug info for field errors (string change).
- Fixed Data corruption in comment IDs (results in broken threading on
  PostgreSQL).
- Fixed machine name not editable if every character is replaced.
- Fixed user picture not appearing in comment preview (Markup change).
- Added optional vid argument for taxonomy_get_term_by_name().
- Fixed Invalid Unicode code range in PREG_CLASS_UNICODE_WORD_BOUNDARY fails
  with PCRE 8.30.
- Fixed {trigger_assignments()}.hook has only 32 characters, is too short.
- Numerous fixes to run-tests.sh.
- Fixed Tests in profiles/[name]/modules cannot be run and cannot use a
  different profile for running tests.
- Numerous JavaScript performance fixes.
- Numerous documentation fixes.
- Fixed All pager links have an 'active' CSS class.
- Numerous upgrade path fixes; notably:
  - system_update_7061() fails on inserting files with same name but different
    case.
  - system_update_7061() converts filepaths too aggressively.
  - Trigger upgrade path: Node triggers removed when upgrading to 7-x from 6.25.

Drupal 7.13, 2012-05-02
-----------------------
- Fixed security issues (Multiple vulnerabilities), see SA-CORE-2012-002.

Drupal 7.12, 2012-02-01
-----------------------
- Fixed bug preventing custom menus from receiving an active trail.
- Fixed hook_field_delete() no longer invoked during field_purge_data().
- Fixed bug causing entity info cache to not be cleared with the rest of caches.
- Fixed file_unmanaged_copy() fails with Drupal 7.7+ and safe_mode() or
  open_basedir().
- Fixed Nested transactions throw exceptions when they got out of scope.
- Fixed bugs with the Return-Path when sending mail on both Windows and
  non-Windows systems.
- Fixed bug with DrupalCacheArray property visibility preventing others from
  extending it (API change: http://drupal.org/node/1422264).
- Fixed bug with handling of non-ASCII characters in file names (API change:
  http://drupal.org/node/1424840).
- Reconciled field maximum length with database column size in image and
  aggregator modules.
- Fixes to various core JavaScript files to allow for minification and
  aggregation.
- Fixed Prevent tests from deleting main installation's tables when
  parent::setUp() is not called.
- Fixed several Poll module bugs.
- Fixed several Shortcut module bugs.
- Added new hook_system_theme_info() to provide ability for contributed modules
  to test theme functionality.
- Added ability to cancel mail sending from hook_mail_alter().
- Added support for configurable PDO connection options, enabling master-master
  database replication.
- Numerous improvements to tests and test runner to pave the way for faster test
  runs.
- Expanded test coverage.
- Numerous API documentation improvements.
- Numerous performance improvements, including token replacement and render
  cache.

Drupal 7.11, 2012-02-01
-----------------------
- Fixed security issues (Multiple vulnerabilities), see SA-CORE-2012-001.

Drupal 7.10, 2011-12-05
-----------------------
- Fixed Content-Language HTTP header to not cause issues with Drush 5.x.
- Reduce memory usage of theme registry (performance).
- Fixed PECL upload progress bar for FileField
- Fixed running update.php doesn't always clear the cache.
- Fixed PDO exceptions on long titles.
- Fixed Overlay redirect does not include query string.
- Fixed D6 modules satisfy D7 module dependencies.
- Fixed the ordering of module hooks when using module_implements_alter().
- Fixed "floating" submit buttons during AJAX requests.
- Fixed timezone selected on install not propogating to admin account.
- Added msgctx context to JS translation functions, for feature parity with t().
- Profiles' .install files now available during hook_install_tasks().
- Added test coverage of 7.0 -> 7.x upgrade path.
- Numerous notice fixes.
- Numerous documentation improvements.
- Additional automated test coverage.

Drupal 7.9, 2011-10-26
----------------------
- Critical fixes to OpenID to spec violations that could allow for
  impersonation in certain scenarios. Existing OpenID users should see
  http://drupal.org/node/1120290#comment-5092796 for more information on
  transitioning.
- Fixed files getting lost when adding multiple files to multiple file fields
  at the same time.
- Improved usability of the clean URL test screens.
- Restored height/width attributes on images run through the theme system.
- Fixed usability bug with first password field being pre-filled by certain
  browser plugins.
- Fixed file_usage_list() so that it can return more than one result.
- Fixed bug preventing preview of private images on node form.
- Fixed PDO error when inserting an aggregator title longer than 255 characters.
- Spelled out what TRADITIONAL means in MySQL sql_mode.
- Deprecated "!=" operator for DBTNG; should be "<>".
- Added two new API functions (menu_tree_set_path()/menu_tree_get_path()) were
  added in order to enable setting the active menu trail for dynamically
  generated menu paths.
- Added new "fast 404" capability in settings.php to bypass Drupal bootstrap
  when serving 404 pages for certain file types.
- Added format_string() function which can perform string munging ala the t()
  function without the overhead of the translation system.
- Numerous #states system fixes.
- Numerous EntityFieldQuery, DBTNG, and SQLite fixes.
- Numerous Shortcut module fixes.
- Numerous language system fixes.
- Numerous token fixes.
- Numerous CSS fixes.
- Numerous upgrade path fixes.
- Numerous minor string fixes.
- Numerous notice fixes.

Drupal 7.8, 2011-08-31
----------------------
- Fixed critical upgrade path issue with multilingual sites, leading to lost
  content.
- Numerous fixes to upgrade path, preventing fatal errors due to incorrect
  dependencies.
- Fixed issue with saving files on hosts with open_basedir restrictions.
- Fixed Update manger error when used with Overlay.
- Fixed RTL support in Seven administration theme and Overlay.
- Fixes to nested transaction support.
- Introduced performance pattern to reduce Drupal core's RAM usage.
- Added support for HTML 5 tags to filter_xss_admin().
- Added exception handling to cron.
- Added new hook hook_field_widget_form_alter() for contribtued modules.
- element_validate_*() functions now available to contrib.
- Added new maintainers for several subsystems.
- Numerous testing system improvements.
- Numerous markup and CSS fixes.
- Numerous poll module fixes.
- Numerous notice/warning fixes.
- Numerous documentation fixes.
- Numerous token fixes.

Drupal 7.7, 2011-07-27
----------------------
- Fixed VERSION string.

Drupal 7.6, 2011-07-27
----------------------
- Fixed support for remote streamwrappers.
- AJAX now binds to 'click' instead of 'mousedown'.
- 'Translatable' flag on fields created in UI now defaults to FALSE, to match those created via the API.
- Performance enhancement to permissions page on large numbers of permissions.
- More secure password generation.
- Fix for temporary directory on Windows servers.
- run-tests.sh now uses proc_open() instead of pcntl_fork() for better Windows support.
- Numerous upgrade path fixes.
- Numerous documentation fixes.
- Numerous notice fixes.
- Numerous fixes to improve PHP 5.4 support.
- Numerous RTL improvements.

Drupal 7.5, 2011-07-27
----------------------
- Fixed security issue (Access bypass), see SA-CORE-2011-003.

Drupal 7.4, 2011-06-29
----------------------
- Rolled back patch that caused fatal errors in CTools, Feeds, and other modules using the class registry.
- Fixed critical bug with saving default images.
- Fixed fatal errors when uninstalling some modules.
- Added workaround for MySQL transaction support breaking on DDL statments.
- Improved page caching with external caching systems.
- Fix to Batch API, which was terminating too early.
- Numerous upgrade path fixes.
- Performance fixes.
- Additional test coverage.
- Numerous documentation fixes.

Drupal 7.3, 2011-06-29
----------------------
- Fixed security issue (Access bypass), see SA-CORE-2011-002.

Drupal 7.2, 2011-05-25
----------------------
- Added a default .gitignore file.
- Improved PostgreSQL and SQLite support.
- Numerous critical performance improvements.
- Numerous critical fixes to the upgrade path.
- Numerous fixes to language and translation systems.
- Numerous fixes to AJAX and #states systems.
- Improvements to the locking system.
- Numerous documentation fixes.
- Numerous styling and theme system fixes.
- Numerous fixes for schema mis-matches between Drupal 6 and 7.
- Minor internal API clean-ups.

Drupal 7.1, 2011-05-25
----------------------
- Fixed security issues (Cross site scripting, File access bypass), see SA-CORE-2011-001.

Drupal 7.0, 2011-01-05 
----------------------
- Database:
    * Fully rewritten database layer utilizing PHP 5's PDO abstraction layer.
    * Drupal now requires MySQL >= 5.0.15 or PostgreSQL >= 8.3.
    * Added query builders for INSERT, UPDATE, DELETE, MERGE, and SELECT queries.
    * Support for master/slave replication, transactions, multi-insert queries,
      and other features.
    * Added support for the SQLite database engine.
    * Default to InnoDB engine, rather than MyISAM, on MySQL when available.
      This offers increased scalability and data integrity.
- Security:
    * Protected cron.php -- cron will only run if the proper key is provided.
    * Implemented a pluggable password system and much stronger password hashes
      that are compatible with the Portable PHP password hashing framework.
    * Rate limited login attempts to prevent brute-force password guessing, and
      improved the flood control API to allow variable time windows and
      identifiers for limiting user access to resources.