In `wptexturize()`, adjust for the treatment of abbreviated years at the end of quotations.
Silence some unit tests that have never passed and may no longer be applicable.

Props miqrogroove.
Fixes #18549.

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Fix abbreviations mixed with quotes, example: `'99% of people'`.
Add/alter unit tests.

Props miqrogroove.
Fixes #26850.

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Prevent bulk actions from being performed when Filter button is clicked.

props layotte.
fixes #28555.
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Pass WP_Customize_Setting instance to 'customize_preview_*' and 'customize_update_*' actions.

props dustyn, DrewAPicture.
fixes #27979.
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TinyMCE: update to 4.0.28+. Includes all changes until 09-06-2014: https://github.com/tinymce/tinymce/tree/32cb108d41b27265c60a8bc1f62855fdfb61e486. Changelog: https://github.com/tinymce/tinymce/blob/32cb108d41b27265c60a8bc1f62855fdfb61e486/changelog.txt.
See #28391.
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Pass WP_Customize_Setting instance to 'customize_save_*' action.

props danielbachhuber.
fixes #27979.
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Don't generate adjacent links in wp_head() for attachments.

props kovshenin.
fixes #21658.
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Don't add # to URL when clicking 'OK' without changing the permalink.

props avryl.
fixes #27594.
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