Weston Ruter bef15d72a4 Customize: Allow Esc key to collapse the currently-expanded panel, section (or control).
Pressing Esc collapses any expanded widget or nav menu item controls, or any control that implements the expanding interface. Also improves alignment between `WidgetControl` and `MenuItemControl`, adding the `expanded` state and associated `expand`/`collapse` methods to nav menu items.

Props purcebr, celloexpressions, westonruter.
Fixes #22237.


git-svn-id: https://develop.svn.wordpress.org/trunk@37347 602fd350-edb4-49c9-b593-d223f7449a82
2016-05-02 19:52:01 +00:00
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