GestureWidget::ignoredGestures QSet:
- elements are inserted in the container in a top-level test function,
then a CustomEvent is constructed and sendCustomGesture() is called,
which sends the events, invoking the GestureWidget::event() overload,
the latter iterates over the container, thus the container isn't
changed while it's being iterated over, because the code can't recurse
into the top-level test function and that's where the container is
modified later on (by inserting or by calling widget.reset() which
clears the container)
- the loop body doesn't change the container
So use ranged-for and std::as_const.
The same logic applies to the GestureItem::ignoredGestures QSet.
Task-number: QTBUG-115839
Change-Id: Icf95e90a8af5aa7e947035704121557494afc326
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
e48e2b3b4a