QList<WidgetMapper>::takeLast() is a needlessly expensive operation
(involves copying a QPersistentModelIndex and a QPointer).
Instead of looping over takeLast() until empty, reverse-iterate
over the list and call removeEventFilter(), then clear the whole
list.
We reverse-iterate to preserve existing behavior. Also, since the
original code popped the WidgetMapper instance before calling
removeEventFilter(), we move the whole list into a local copy
before iterating. There's little chance that a removeEventFilter()
call will cause reentrancy into QDataWidgetMapper, but better safe
than sorry.
This and the previous change together save 448 bytes of text size in
libQt5Widgets.
Change-Id: I1bfe907751659f31e618aa05bbb7b840f0aa61f4
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
2d4954810b