Ensure proper slashing of the password on install.

This isn't the ideal fix, but it makes things work for now.

props nofearinc.
fixes #26573.

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Upgrader skins: Strip tags before displaying error data.

fixes #25394.

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WP class: Remove duplication of the post_type query var, also specified as a public QV.

props prettyboymp.
fixes #23862.

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Inline documentation for hooks in wp-includes/kses.php.

props siobhyb, DrewAPicture.
fixes #25800.

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Don't clip post titles in the dashboard activity widget as it hides direct links to comments.

props SergeyBiryukov.
fixes #27474.

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Better focus styles for form elements in the admin. These are purposefully not keyed to admin color schemes, as different colors could communicate a state like an error as opposed to focus. props celloexpressions. fixes #27173.

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Make the CSS selector for current playlist item `<img>` more specific so the width is properly constrained.

Hide the `<audio>` element in the playlist to prevent a flicker when loading - MEjs hides the audio element anyway.

See #27525.


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Fix LTR field handling:
 * Restore .ltr class lost in the conversion to RTL as a build process.
 * Make email and url inputs always LTR.
 * Set an email field on user-edit to be LTR.

props MikeHansenMe, yoavf for initial patches.
fixes #26824.

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Themes screens: Bump to 20 items per page so it fills a high resolution display. see #26968.

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WP_Theme: Return false from the display() method when get() fails.

Fixes a potential warning on the themes page when the active theme is deleted.

fixes #26873.

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Revert [27166].

We should not be accounting for improper assignment of WP_Query properties.

fixes #26321.

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