Andrea Fercia 395823c9cd Customize: Improve the widgets and menu items search.
- adds a "search" icon into the search fields
- adds a hidden description for the widget search field, targeted by `aria-describedby`
- adds the "clear-results" button to the widgets search
- removes the `change` and `search` events bound on the widget search, for these "live searches" WordPress should standardize on `input` (+ `keyup` when needed)
- adds property and function to keep track and update the number of the widgets search results
- the widgets search results are now announced via `wp.a11y.speak()`
- adds a visible and audible message when there are no widgets search results
- moves some CSS to `customize-controls.css`

Props ryankienstra, melchoyce, afercia.
Fixes #36908.


git-svn-id: https://develop.svn.wordpress.org/trunk@38709 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-03 16:27:55 +00:00
2016-09-06 18:12:09 +00:00
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