Shortcode JS: Avoid errors when an escaped shortcode includes a newline between brackets.

Merges [28223] to the 3.9 branch.

props gcorne.
props Clorith, jorbin for tests.
fixes #27907.

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Customizer: Allow to skip cropping header images if image width is smaller than or equal to theme width.

Merges [28219] to the 3.9 branch.

fixes #27936.

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TinyMCE: Restore old wordpress_adv_hidden editor parameter to enable force-showing the kitchen sink.

Merges [28181] to the 3.9 branch.

props azaozz.
fixes #27963.

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Alter the layout of the checkboxes in the modal view for Audio/Video Details to allow translations more room to breathe.

Merges [28184] to the 3.9 branch.

props wonderboymusic.
fixes #27893.

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Rmove version string from Thickbox so it assumes the WP core version. Bust some caches.

Merges [28176] to the 3.9 branch.

props celloexpressions.
fixes #27861.

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Media: Use the proper translated string for Video Playlist "drag info".

Merges [28178] to the 3.9 branch.

props wonderboymusic.
fixes #27937.

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Support RTL properly when displaying playlists.

Merges [28173] to the 3.9 branch.

props SergeyBiryukov.
fixes #27924.

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TinyMCE: When adding a caption to an image that is in a paragraph with other text, move the caption node above the paragraph instead of below.

Merges [28190] to the 3.9 branch.

props azaozz.
fixes #27922.

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TinyMCE: fix the "active" state of the Link button when an image wrapped in a link is selected.

Merges [28185] to the 3.9 branch.

props azaozz.
fixes #27847.

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Properly translate 'Select Poster Image'.

Merges [28158] to the 3.9 branch.

props dimadin.
fixes #27845.

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