Add missing array keys for connection type in `request_filesystem_credentials()`.

see [28456].
fixes #29347.

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git-svn-id: http://core.svn.wordpress.org/trunk@29354 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin compatibility is based on your version of WordPress, not your install.

fixes #29313.
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Media: Only fire keyboard events for the Attachments view once.

Firing them twice was breaking arrow key navigation in media attachment grids.

props gcorne.
fixes #29304.

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Apply accessibility improvements to Plugins screen too.

props SergeyBiryukov.
fixes #29342.
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Media Grid: restore focus to the selected item when shift-tab away from the attachment details sidebar.

Fixes #29303.

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Media Grid: Don't make checkboxes tabbable when in bulk select media grid mode, fixes tabbing in bulk select mode.

Props adamsilverstein.
See #28822.

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