Andrea Fercia d6a73ef110 Media: avoid page scrolling when opening the media modal.
Moves focus to a proper element within the media modal to avoid the underlying
page to scroll to the bottom. Removes the media modal `freeze` option.

Props andreiglingeanu, adamsilverstein.
Fixes 39859.

Built from https://develop.svn.wordpress.org/trunk@42624


git-svn-id: http://core.svn.wordpress.org/trunk@42453 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-01-31 17:03:33 +00:00
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