Don't overwrite text selections made in focus handlers.

Don't overwrite text selections made in focus handlers.

Defer giving focus to TextInput or TextEdit until after other mouse
press handling has been performed, otherwise setting the cursor position
will overwrite any selection or cursor position set in the
on(Active)FocusChanged handler.

Change-Id: I6332642484de65138a444987b5a81be69c6f835f
Reviewed-by: Yann Bodson <yann.bodson@nokia.com>