In `remove_user_from_blog()`, avoid a potentially expensive `IN` query before invalidating the reassigned post and link caches.

Props kovshenin.
Fixes #25545. (Again.)


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Rather than removing the 3rd argument in `WP_Object_Cache::delete()`, mark it as `$deprecated`.

See [27064].
Props SergeyBiryukov.
Fixes #22478.


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Partially revert [27101], [27102], [27141], and [27142]. Those commits introduced new functions to sync up cache invalidation events. The current commit alters existing internals.

"The cache invalidation with static was introduced in r9102 with version 2.7. Multisite wasn't in core back then, so something like switch_to_blog() wasn't a concern, but now it breaks if you switch the blog in between calls to clean_term_cache."

This solution is simpler. All unit tests pass. Removes unnecessary tests linked to removed functions.

Props kovshenin.
Fixes #14485, #22526.


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Use jQuery.prop('checked') instead of jQuery.attr('checked'), which is deprecated.
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TinyMCE: fix styling in the Charmap modal so the click targets are as large as the table cells. Remove the "Close" button and close the modal after inserting the special char. Fixes #27107.
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Don't iterate over `$wp_query->posts` in `update_post_thumbnail_cache()` if it is empty. Adds unit tests.

Props SergeyBiryukov, for the original patch.
Fixes #26321.
 

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Merge two similar strings. props pavelevap. fixes #27096.
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