Fix CSS clashing on the Network Themes page.

props SergeyBiryukov.
see #26517 for trunk.

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Adjust widths of toolbar items at mobile sizes for better fitting on narrow screens. Fixes toolbar wrapping when using multisite.

props iammattthomas.
see #26537 for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@26801 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Themes: Search the theme's slug too.

props matveb.
see #26730 for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@26802 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Keyboard navigation friendliness for themes.php.

props matveb, azaozz, jorbin.
see #26527.

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git-svn-id: http://core.svn.wordpress.org/trunk@26803 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix another CSS clashing on the Network Themes page.

props SergeyBiryukov.
see #26513 for trunk.
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git-svn-id: http://core.svn.wordpress.org/trunk@26804 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Pass the $user_id to the `admin_color_scheme_picker` hook for context. props nacin. see #26607 for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@26805 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Dashicons: Update to the latest dashicons files.

props empireoflight, melchoyce.
see #26518 for trunk.
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Uploads: Fix the Order of Operations for wp_mkdir_p() which caused this branch to never be hit. Props fboender. Fixes #26781 for trunk. See #25822

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Break long words in Quick Draft content to prevent ugly overflow, as was previously done. props aubreypwd, SergeyBiryukov. see #26658 for trunk.

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Move media modal colors out of `colors.css` and into `media-views.css`, as the modal can be triggered on the front end. props avryl, props collinsinternet for the initial patch. see #26677 for trunk.

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TinyMCE: update compat3x.min.js and bump $tinymce_version. See #24067, fixes #26750.
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Update the wp-inclues/vars.php file header to include Nginx as a recognized web server.

Props netweb for the initial patch. Props markjaquith.
Fixes #26249.

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git-svn-id: http://core.svn.wordpress.org/trunk@26812 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a fatal error in wp_reset_postdata() if $wp_query global is not set.

see #26775 for trunk.
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git-svn-id: http://core.svn.wordpress.org/trunk@26813 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Deprecate rich_edit_exists(). It doesn't make sense to support deleting the TinyMCE directory when we have auto-updates. Fixes #26786.
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git-svn-id: http://core.svn.wordpress.org/trunk@26814 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: re-enable soft resizing of images inside the editor. See #24067.
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git-svn-id: http://core.svn.wordpress.org/trunk@26815 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix alignment and borders of plugin/theme updates on the Updates screen.

props morganestes, ocean90.
see #26699, for trunk.

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git-svn-id: http://core.svn.wordpress.org/trunk@26816 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: improve handling of Read More and Nextpage tags. See #24067, fixes #16239.
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TinyMCE: add/remove the 'alignnone' class when aligning images without captions. See #24067.
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git-svn-id: http://core.svn.wordpress.org/trunk@26822 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unnecessary sprintf(). props jdgrimes. fixes #25489.
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TinyMCE: fix `send_to_editor()`. It no longer needs to replace shortcode strings with html placeholers before inserting them in the editor. This is handled properly by the editor's `'BeforeSetContent'` event callbacks. See #24067.
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