When trying to do a straight right/left/up/down swipe, a minimal
change in the other direction caused to the gesture to be canceled.
Introduce a threshold for checking such to prevent this.
Task-number: QTBUG-46195
Change-Id: I3e199f2ec0c81d23a16073b1f5b8fff004958239
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>