Make focusables behave correctly when $element != $focusable

When there is more to the $element than $focusable, handle mousedown
events on it and prevent default so the browser doesn't try and place
the cursor inside the ce=false element. Also use cursor:default.

Change-Id: I450537fd9239cef86838f22c082f0934f99a3487
Merge "Make focusables behave correctly when $element != $focusable"