TinyMCE wpView: when clicking on the Edit button, move the focus back to the editor before opening the modal. This is needed for IE so TinyMCE can save the proper DOM "bookmark", and makes it possible to move the focus to the modal after it is opened.
See #30817.

git-svn-id: https://develop.svn.wordpress.org/trunk@30986 602fd350-edb4-49c9-b593-d223f7449a82