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2869e3a186
Use `pagehide` event instead of `unload` in the following cases: * For classic editor to release the post lock. * In Text widget to rebuild editor after dragging widget to new location in classic widgets interface. * To clear out the `window.name` when navigating away from a post preview. * To suspend heartbeat, while also using `pageshow` event to resume as if it had been a focused tab in case page restored from bfcache. Also: * Remove obsolete mobile cleanup code in `js/_enqueues/lib/gallery.js` (introduced in [9894]). Do same for `src/js/_enqueues/wp/media/models.js` (introduced in [22872]). See #22552. * Remove obsolete Firefox-specific workaround in `js/_enqueues/wp/mce-view.js` from [39282]. See #38511. Fixes #55491. Props spenserhale, westonruter, adamsilverstein, azaozz, shawfactor, peterwilsoncc, swissspidy. Built from https://develop.svn.wordpress.org/trunk@56809 git-svn-id: http://core.svn.wordpress.org/trunk@56321 1a063a9b-81f0-0310-95a4-ce76da25c4cd