iOS: stop keyboard from reopending after the gesture finishes

On iOS we have set the style hint 'SetFocusOnTouchRelease'. This is in
conflict with the 'hide keyboard' gesture, since a control can
try to regain focus (and open the keyboard) if the gesture ends
on top of it. So we need some extra work-around code to prevent this
from happening.

The correct way would probably be to cancel the touch sequence once
the gesture triggers, but this is not well implemented in Qt yet,
especially in combination with widgets and mouse synthesis.

Since usage of the gesture behaves really bad in some cases (e.g
if using the TextEdit example) we need to apply this for now.

Change-Id: Ib3327c0bd94d722b4c4793bc6d152d6d19810e4b
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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