Fix a crash in tst_QTouchEvent::deleteInRawEventTranslation().

The test deletes a widget in QEvent::TouchBegin.

This is part of a series of patches to revive the test; it is currently
not run since tests/auto/gui/kernel/qtouchevent/qtouchevent.pro
is missing CONFIG += testcase.

Task-number: QTBUG-46266
Change-Id: I65c0a431ff1807133438764dd8b3c16bb9cb6743
Reviewed-by: Caroline Chao <caroline.chao@theqtcompany.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index d61737efc9..aa7940b623 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -4377,7 +4377,7 @@ bool QApplicationPrivate::translateRawTouchEvent(QWidget *window,
     QHash<QWidget *, StatesAndTouchPoints>::ConstIterator it = widgetsNeedingEvents.constBegin();
     const QHash<QWidget *, StatesAndTouchPoints>::ConstIterator end = widgetsNeedingEvents.constEnd();
     for (; it != end; ++it) {
-        QWidget *widget = it.key();
+        const QPointer<QWidget> widget = it.key();
         if (!QApplicationPrivate::tryModalHelper(widget, 0))
             continue;
 
@@ -4417,7 +4417,8 @@ bool QApplicationPrivate::translateRawTouchEvent(QWidget *window,
             // has been implicitly accepted and continue to send touch events
             if (QApplication::sendSpontaneousEvent(widget, &touchEvent) && touchEvent.isAccepted()) {
                 accepted = true;
-                widget->setAttribute(Qt::WA_WState_AcceptedTouchBeginEvent);
+                if (!widget.isNull())
+                    widget->setAttribute(Qt::WA_WState_AcceptedTouchBeginEvent);
             }
             break;
         }