Fix crash with stylesheet if widget change style in the changeEvent

The problem appeared with KLineEdit and its proxy style.

When setting a stylesheet, we create a QStyleSheetStyle in 9# and set it
to the widget, which receive a changeEvent, that will set again the style
so 3# will create a new QStyleSheetStyle with the new proxy. and set it.
in 2# we will dereference the 'old' QStyleSheetStyle (the one created in #9)
that will destroy it.
Then, later in #7, we will still access that style ('newStyle') and we crash

0# QStyleSheetStyle::~QStyleSheetStyle()
1# QStyleSheetStyle::deref()
2# QWidgetPrivate::setStyle_helper(QStyle*, bool, bool)
3# QWidget::setStyle(QStyle*) (qwidget.cpp:2523)
4# ChangeEventWidget::changeEvent(QEvent*)
[...]
6# QCoreApplication::sendEvent(QObject*, QEvent*)
7# QWidgetPrivate::setStyle_helper(QStyle*, bool, bool)
9# QWidget::setStyleSheet(QString const&) (qwidget.cpp:2470)

The solution is to change the order, and do not use 'newstyle' after
we sent the event.

The origStyle is now protected wy a QWeakPointer, but this is
just for safety reason and not related to the crash.

Reviewed-by: JBache

0 files changed, 0 insertions, 0 deletions