WordPress/wp-includes
Helen Hou-Sandí 5567d03278 Nav menus: Better JS performance on initial load of edit screen.
The accessibility helpers previously processed all items when editing a menu, which was quite slow to the point of being unresponsive for large menus. They now only process items when they are expanded or a user comes near them in some way, such as hover or focus.

Also simplifies a redundant set of click event handlers down to one, which further enhances performance.

props atimmer, sevenspark.
fixes #25698.

Built from https://develop.svn.wordpress.org/trunk@31604


git-svn-id: http://core.svn.wordpress.org/trunk@31585 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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