BT: Fix update regression for cached QGraphicsItem (Elastic Nodes stuck)

This fixes a bug in 4.5.0 where cached items that call update() after
they have been moved or transformed failed to get a call to paint(),
so the last cache image was used to draw. The easiest way to reproduce
this bug is in the Elastic Nodes example. If you press, wait, then
release, the nodes will consistently move to sunken state, then back
to normal state. But if you click quickly while moving the mouse, the
nodes will stay sunken.

The bug was that the item was marked as dirty as a result of being moved,
and when the mouse button was released, the node item's call to update()
was discarded, as the item was "already dirty".

The fix is to allow invalidation of the cache even if the item is
marked as dirty.

Reviewed-by: bnilsen
(cherry picked from commit 08feb22f9a924ce120da8b5c6e1669d2a630dd54)

0 files changed, 0 insertions, 0 deletions