Prefix the `notoptions` cache key in the multisite `site-options` group with `$wpdb->siteid` to avoid collisions and race conditions when using a fancy multi-network setup. Adds unit test.

Fixes #25883.


Built from https://develop.svn.wordpress.org/trunk@26304


git-svn-id: http://core.svn.wordpress.org/trunk@26209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets:
- Prevent dragging of the widget-in-question when the chooser is open.
- Don't show more than one spinner when saving widgets positions.
- Disable selecting of text in the widget title. Prevents selecting/highlighting most of the screen when dragging on slower devices.
See #25821.
Built from https://develop.svn.wordpress.org/trunk@26306


git-svn-id: http://core.svn.wordpress.org/trunk@26210 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `update_meta_cache()`, ensure that meta is always stored in the same order. Removes an unnecessary `$wpdb->prepare` statement. Adds unit test.

Props mattheu.
Fixes #25511.


Built from https://develop.svn.wordpress.org/trunk@26307


git-svn-id: http://core.svn.wordpress.org/trunk@26211 1a063a9b-81f0-0310-95a4-ce76da25c4cd