Respect DirtyForceUpdate in QSGBatchRenderer.

There is a way this could have been done slightly more efficitently.
If we moved all "combined" logic out of the scene graph and into the
Node shadow tree, we could ignore the forceupdate all
together. However, this is a quite large change for what is currently
a non-common case. It would also increase overall memory consumption a
bit as we would have superfluous combined matrix and opacity in the
QSGNodes.

Task-number: QTBUG-33838
Change-Id: I06c486ace2be15bef1f1dc72a8b41cb649d7c813
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Fix regression in pressDelay behavior.

Don't deliver a press event when a Flickable is moved before
the pressDelay expires. This prevents delegates flickering
between pressed and unpressed states when beginning to
flick a Flickable.

Fixes regression introduced by
429af6244518172e19abf7fecd7112f26bac6b31/
d02131e743597b9bd3070d986c61a1c91ea8317a.

Task-number: QTBUG-31168
Change-Id: Id4e853fabe99000837df3681acd8fc4e76d2e9b3
Reviewed-by: Martin Jones <martin.jones@jollamobile.com>