* Re-work how and when widget forms get updated.
* Replace ad hoc hooks system with jQuery events,
* Add `widget-updated`/`widget-synced` events for widget soft/hard updates.
* Enter into a non-live form update mode, where the Apply button is restored when a sanitized form does not have the same fields as currently in the form, and so the fields cannot be easily updated to their sanitized values without doing a complete form replacement. Also restores live update mode if sanitized fields are aligned with the existing fields again.
Note: jQuery events are *not* final yet, see #19675.
props westonruter.
see #27491.
Built from https://develop.svn.wordpress.org/trunk@27909
git-svn-id: http://core.svn.wordpress.org/trunk@27740 1a063a9b-81f0-0310-95a4-ce76da25c4cd
* Support widgets which are higher than browsers viewport.
* Use widgets width as max-width.
* Don't animate the width of wide widgets to make them visible, instead fade them in/out.
* Fix Chrome flickerings while updating wide widgets.
props adamsilverstein, westonruter, ocean90.
see #27348.
Built from https://develop.svn.wordpress.org/trunk@27798
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Dominik Schilling