Fix bug where a tap over stacked mouse areas generates a double click

You have two mouse areas, one on top of the other.
1 - You tap the top one.
2 - That top mouse area receives a mouse press event but doesn't accept it
Expected outcome:
 3 - the bottom mouse area gets clicked (besides press and release mouse events)
Bogus outcome:
 3 - the bottom mouse area gets double clicked.

Change-Id: I10cac52b5e8edea781fe88e70c4092eb38bcf763
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>