Add new fit-content rules to accompany intrinsic width on adminbar dropdown wrappers. Fixes #26430, props Jayjdk.
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Inline documentation fixes for hooks and functions introduced in 3.8.0.

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git-svn-id: http://core.svn.wordpress.org/trunk@26625 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Updates to the About page:

* A live color scheme preview
* Replace the hard-coded version number
* Copy edits
* New screenshots
* Size adjustments to the header and WP badge
* Capitalize 'Open Sans'

See #26387, props markoheijnen, ryelle, siobhan, melchoyce.


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Themes: If a theme only has a very-old-school 300px-wide screenshot (or narrower), don't stretch it.

props matveb.
fixes #26459.

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Themes: Adjust screenshot ratios.
 * On the details overlay, always show the full 4/3 ratio.
 * On the grid, reduce to ~3/2 only if the screen width is less than 1400px. Otherwise, show the screenshot at 4/3 ratio.

props matveb, nacin.
fixes #26159.

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Revert Twenty Ten's original screenshot. Was using Kubrick to test [26738]. I hope this gave lancewillett a laugh. see #26459.

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