Issue #2318435 by dawehner, Gábor Hojtsy: Fixed Views menu items disappears when editing menu.

core/modules/file/config/install/views.view.files.yml

core/modules/node/config/install/views.view.content.yml

...ules/user/config/install/views.view.user_admin_people.yml

core/modules/views/config/schema/views.display.schema.yml

core/modules/views/src/Plugin/Menu/ViewsMenuLink.php

core/modules/views/src/Plugin/views/display/Page.php

...modules/views/src/Plugin/views/display/PathPluginBase.php

...odules/views/src/Plugin/views/wizard/WizardPluginBase.php

core/modules/views/src/Tests/Plugin/DisplayPageWebTest.php

...t_config/test_views/views.view.test_page_display_menu.yml