Avoid PHP notices if 'plugin' is not set for tab=plugin-information.

props avryl.
fixes #29936.
Built from https://develop.svn.wordpress.org/trunk@29882


git-svn-id: http://core.svn.wordpress.org/trunk@29638 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: fix the 'wpgallery' plugin to use a placeholder for galleries when either the 'wpview' plugin or wp.mce is not loaded. Fixes #28756
Built from https://develop.svn.wordpress.org/trunk@29883


git-svn-id: http://core.svn.wordpress.org/trunk@29639 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Quicktags: move focusing the editor after inserting content to the end of the code blocks. Fixes a bug in Chrome where both the textarea and the window may auto-scroll to unexpected position on clicking a Quicktags button. Part props avryl, fixes #29944 for trunk.
Built from https://develop.svn.wordpress.org/trunk@29884


git-svn-id: http://core.svn.wordpress.org/trunk@29640 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't create dummy data for each date query test.

The integration tests for using date_query in WP_Query require the creation of
dummy post data, much of which is common between a number of tests. However,
newer tests do not require as much data, so to reduce overhead we create the
data explicitly only when we need it, instead of in the setUp() method.

See #29781.
Built from https://develop.svn.wordpress.org/trunk@29885


git-svn-id: http://core.svn.wordpress.org/trunk@29641 1a063a9b-81f0-0310-95a4-ce76da25c4cd