wpView:
- Makes sure that the editor is focused when clicking on a wpview.
- When a view is the first or last node in the editor and a click on the area around the view adds a new paragraph, deselect the wpview so that the new paragraph is properly focused.
- When navigating via keyboard, select or deselect wpviews as appropriate.
Props gcorne, see #26959

git-svn-id: https://develop.svn.wordpress.org/trunk@27582 602fd350-edb4-49c9-b593-d223f7449a82