Resizing Images Sometimes Sets Unusable Size

Resize handle event handling was set up to bind on focus and
unbind on document mouse up. The problem is that focus can be
set programmatically and sometimes more than once. This would
cause the image to be properly resized once, but immediately
resized again to 0x0. Now, before binding events to the resize
handles, all resize handle events are unbound.

Change-Id: I22b7902d303b5ca43e132c121d743d6815980fc6
Merge "Resizing Images Sometimes Sets Unusable Size"