Prevent the deletion of a theme while it has an active child theme.

Fixes #29580
Props karpstrucking, jesin

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git-svn-id: http://core.svn.wordpress.org/trunk@30687 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't over-target buttons in the publish meta box.

This selector caused breakage for any custom buttons added.

props ericlewis.
fixes #30035.

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WPDB: When looking up the character set for a table or column, make sure we send the table name to MySQL in the correct case, as MySQL can be configured with case sensitive table names.

Fixes #30538.

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git-svn-id: http://core.svn.wordpress.org/trunk@30689 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct the width of the background vignette in the plugin info modal.

Fixes #28229

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git-svn-id: http://core.svn.wordpress.org/trunk@30690 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert r30115 which was a breaking change for code which interacts with the return value of `get_metadata()` when no meta key is specified.

See #15030

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Update the tests for `get_metadata()` to reflect the revert in r30701.

See #15030

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Using let's properly in inline comments lets us move on to more pressing matters of inline documentation.

Props trepmal.
Fixes #30570.

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git-svn-id: http://core.svn.wordpress.org/trunk@30693 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Unit Tests: The `test_set_allowed_incompatible_sql_mode()` test tries to set the `NO_ZERO_DATE` sql mode, which was removed in MySQL 5.7. This causes the test to incorrectly fail when run against MySQL 5.7.


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git-svn-id: http://core.svn.wordpress.org/trunk@30694 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Admin help text changes for the General Settings screen, post editing screen, network settings screen, and user editing screen.

Fixes #30547
Props kpdesign

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git-svn-id: http://core.svn.wordpress.org/trunk@30695 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't fix the position of the admin toolbar submenus when the viewport is below 600px. This avoids them becoming detached from the admin toolbar when scrolling.

Fixes #29905
Props avryl

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