Fix TinyMCE Views in IE8 and 7:
- Add fallback background images for dashicons.
- Fix hiding the clipboard while still allowing the contents to be selected.
- Work around lack of border-box in gallery styles.
(Includes precommit cleanup for theme.js)
Props gcorne, fixes 27546
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TinyMCE Views in IE8 and 7: change deselect event only for old IE, props gcorne, fixes #27546
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Update license copyright year to 2014.

fixes #27728.

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XML-RPC: Fix bracing of conditionals around doc blocks.

props redsweater, DrewAPicture.
fixes #27506.

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Update TinyMCE to the current development version, 4.0.21.1. Fixes #27744
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Bump MediaElement.js to `2.14.2`. Release Notes: https://github.com/johndyer/mediaelement/commit/743f4465231dc20e6f9e96a5cb8b9d5299ceddd3.

Fixes #27582.


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Fix tabbing out of the title field on Media -> Edit Media screen, fixes #27750
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Fix typo in var definition in [28069], see #27750
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Editor: Ensure the link dialog does not display when styles are missing.

props mattheu.
fixes #27605.

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Account for new cropping settings in the image editor.

props Otto42, SergeyBiryukov.
fixes #19393.

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Fix color of disabled buttons in non-default color schemes, props ryelle, fixes #27759
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Add the new modlas styling to the importer details Thickbox on Tools -> Import. Props ocean90, fixes #26952
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Don't include the non-minified tinymce.js in /build. Load it when running from /src, else load wp-tinymce.js.gz (production) or tinymce.min.js (SCRIPT_DEBUG). Props nacin, fixes #27739
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Translate custom header customize control strings. Remove `final` added before beta to see what breakage we might cause by refactoring this class.

see #21785. fixes #27738.

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Priority fixes for various existing hook documentation.

Props kpdesign.
See #26869

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TinyMCE wpViews:
- Prevent undo steps from being added when the body of a wpview changes.
- Add unbind() to handle cleanup on DOM rebuilding in TinyMCE.
- Ensure that MediaElement's cleanup routine is run on every player in all instances of the editor.
- Initialize the players after some delay to ensure CSS is loaded.
Props gcorne and wonderboymusic, fixes #27389
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Update $_old_files for 3.9. see #27775.

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Custom Headers: Allow for longer strings.

props ehg.
see #27755.

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User Query: Don't blindly re-append new meta queries for capabilities.

fixes #21119.

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About page: Translate all Under the Hood strings.

see #27713.

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