Fixes issue whereby a user would see nothing happen if the pane is collapsed while they shift-click to edit an element in the preview. Props curdin, celloexpressions, westonruter. See #27403. Fixes #36678. Built from https://develop.svn.wordpress.org/trunk@38492 git-svn-id: http://core.svn.wordpress.org/trunk@38433 1a063a9b-81f0-0310-95a4-ce76da25c4cd