Copy media modal colors out of colors.css and into media-views.css, as the modal can be triggered on the front end.

Merges part of [26929] to the 3.8 branch.

props avryl.
props collinsinternet for the initial patch.
fixes #26677.

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Eliminate the 1px padding adjustment on active buttons because it creates an un-clickable dead zone 1px high and spanning the entire width of the button.

Merges half of [26993] to the 3.8 branch.

props johnbillion.
see #26700.

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Dashboard widgets: Don't link to Pages or Posts for Authors or Contributors respectively.

Merges [26999] to the 3.8 branch.

props mattheu.
fixes #26574.

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3.8.1-beta1

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Themes screen: Various IE8 adjustments and fixes.

Merges [27007] to the 3.8 branch.

props morganestes, matveb.
fixes #26541.

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Responsive improvements to submenus in the toolbar.

Merges [27006] to the 3.8 branch.

 * Remove .ab-sub-wrapper rules in the 782px media query, as they're duplicates of the rules set on line 161.
 * Reposition the arrows for submenus at responsive sizes where the menus are taller.
 * Set the submenu position to static at smartphone sizes, so it's not positioned outside of its parent (and thus offscreen).

props undergroundnetwork, iammattthomas.
fixes #26720.

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Improve keyboard accessibility for the admin menu when in responsive mode, props SergeyBiryukov, fixes #26639 for 3.8.1.
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Themes screen: Add aria-describedby attributes to provide better information to screen readers.

Merges [27012] to the 3.8 branch.

props joedolson for initial patch.
fixes #26602.

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3.8.1-RC1

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Properly detect line height of Quick Draft textarea.

Merges [27021] to the 3.8 branch. Half was committed in [27013].

props batmoo.
fixes #26915.

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3.8 branch: Undo the colors.css changes in [26938] and move the rules to wp-admin.css.

This will prevent us from shipping a full re-build of the color schemes in 3.8.1.

see #26699.

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3.8.1

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Merge remote-tracking branch 'upstream/3.8-branch' into 3.8-branch