Twenty Fourteen: allow pages to have featured images, props iamtakashi. Fixes #25325.

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 Twenty Fourteen: fill browser height to 100% for views with short content. Accounts for footer widgets, in which case the height isn't set to 100% so that the widgets remain visible. Props wycks and taupecat, fixes #25389.

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Twenty Fourteen: remove unneeded `.single-attachment` body class selectors, props iamtakashi. Fixes #25541, see #25506.
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Twenty Fourteen: remove unnecessary `no-sidebar` class value in front page template. Props iamtakashi, fixes #25543.
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Upgrader: Create Directories with a minimum of 0755 and files with a minimum of 0644 when upgrading, which matches pre-3.7 behaviour. Fixes #20069

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Twenty Fourteen: minor color contrast and a11y fixes, see #25054.
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Show a label for the "Home" page nav menu item checkbox. props SergeyBiryukov. props ericlewis for the initial patch. fixes #25410.

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Twenty Fourteen:  a11y fix for keyboard navigation and Skip Content link, see #25054.
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Twenty Fourteen: remove title attributes for better accessibility. Props sabreuse for original patch, see #25054.
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Make sure when resizing an image according to ratio we do not end up with a zero-pixel width or height.

props plocha.
fixes #25038.

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Only add one body class when multiple post types manage to be present for a post type archive due to pre_get_posts manipulation.

fixes #25341.

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Default themes: Don't use /** docblocks for simple multiline comments.

props DrewAPicture, ericlewis.
fixes #25256.

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Hook documentation for wp-admin/admin.php.

props DrewAPicture for initial patch.
fixes #25442.

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TinyMCE: add support for IE11.
- Add the latest changes from the 3.x branch upstream.
- Reduce the number of calls to tinyMCEPopup.restoreSelection() in our custom plugins.
- Remove the deprecated execCommand("mceBeginUndoLevel");.
See #25281.
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Twenty Fourteen: merge recent stylesheet changes to RTL, and file miscellaneous CSS cleanup.

RTL still needs more responsive fixes, see #25332 -- and a11y menu fixes, see #25054. 
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In the event that an Automatic Upgrade fails, send a failure status on the next API request to indicate that it failed, and if the rollback was successful.
See #22704

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Correct a variable typo in [25750]. See #22704

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After a upgrade fails, and we successfully rollback to a previous version, Don't send the version we rolled back to to the API, just that it was successful. See [25750]. See #22704

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Twenty Fourteen: remove CSS transitions, props iamtakashi. Fixes #25553.
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Twenty Fourteen: improve primary navigation styles for a clearer distinction between hover and the current page highlight, and change color to harmonize with the search toggle. Props iamtakashi, fixes #25554.
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