- Patch #24157 by chx/Robin/...: changed file_exists() to is_file() to fix...

- Patch #24157 by chx/Robin/...: changed file_exists() to is_file() to fix several problems with modules using theimage toolkit.

includes/image.inc

@@ -80,7 +80,7 @@ function image_toolkit_invoke($method, $params = array()) {
  *      'mime_type': image's MIME type ('image/jpeg', 'image/gif', etc.)
  */
 function image_get_info($file) {
-  if (!file_exists($file)) {
+  if (!is_file($file)) {
     return false;
   }
 

includes/theme.inc

@@ -499,7 +499,7 @@ function theme_links($links, $delimiter = ' | ') {
  *   A string containing the image tag.
  */
 function theme_image($path, $alt = '', $title = '', $attributes = NULL, $getsize = TRUE) {
-  if (!$getsize || (file_exists($path) && (list($width, $height, $type, $image_attributes) = @getimagesize($path)))) {
+  if (!$getsize || (is_file($path) && (list($width, $height, $type, $image_attributes) = @getimagesize($path)))) {
     $attributes = drupal_attributes($attributes);
     return '<img src="'. check_url($path) .'" alt="'. check_plain($alt) .'" title="'. check_plain($title) .'" '. $image_attributes . $attributes .'/>';
   }