`wptexturize()` should handle apostrophes before primes.

Props nacin, miqrogroove.
Fixes #22823.

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In `wptexturize()`, allow dashes before and after curly quotes. Example: This is what she said---"Wow that is cool."

Adds unit tests.

Props adamsilverstein, miqrogroove.
Fixes #20342.

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In `wptexturize()`, ensure that texturization does not corrupt contents of HTML elements, HTML comments, and smartcode attributes.

Adds a variety of unit tests/assertions.

Props miqrogroove.
Fixes #12690, #8912, #27602.

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A little more abstraction in the `WP_oEmbed` class. Fixes #24381.
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`edit.php?post_type=attachment` should redirect to `upload.php`. Without the redirect, the user is presented with an empty list table. There are probably other issues to address overall, but this accomplishes what the ticket wants.

Props knutsp.
Fixes #27951.

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Add screen reader labels to the date inputs on the post editing screen. Fixes #25461. Props frank-klein.
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Only include relevant post authors in WXR exports. Fixes #20206. Props jeremyfelt.
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Fix the layout of the Image Details modal, props gcorne, see #24716 [28682]
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In `wp_insert_term()`, when no slug is provided, check for an existing term by name. If it exists, use that slug instead of calling `sanitize_title( $name )`.

Prevents creating an endless number of terms like `A+` or `$$$$` in any given taxonomy.

Props wonderboymusic, SergeyBiryukov, aaroncampbell.
Fixes #17689.

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