TinyMCE: update to 4.0.28. Also includes https://github.com/tinymce/tinymce/commit/43fff5b45344e0101d7d75d8e3c01e9758f0d20f. Part-props avryl for the patch on #27941, fixes #28391, #27941.
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At long last, improved keyboard accessibility for the media modal.

props lessbloat, grahamarmfield, sharonaustin, bramd.
see #23560.

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Better align link element focus with form focus styling, which also improves the visibility. props zamfeer. see #28267.

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Forcing SSL logins now forces SSL for the entire admin, with no middle ground.

fixes #10267.

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Force SSL on the frontend via canonical when the home URL uses the https scheme.

fixes #27954.

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Append the date to $wp_version in the build output, for nightly packages.

props azaozz.
fixes #26751.

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When parsing the main query, if `s` is set to empty: `?s=` and `$this->is_main_query() && array_key_exists( 's', $this->query )` - kill the query instead of loading the homepage. This will load the search page with no results.

Fixes #11330.


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If `post__in` or `post_parent__in` is passed to `WP_Query` as an empty array, nuke the query. Both vars are currently only checked for truthiness after which they are ignored. Setting these vars at all indicates explicit filtering being desired.

Adds unit test.

Fixes #28099.

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