QPrintDialog on macOS: Don't crash when parent is not a window

The test case is an incomplete version of the test that will be added to
verify the fix for the referenced bug report. The test crashes already
when showing the dialog without this fix.

Task-number: QTBUG-116277
Change-Id: I969a723157f6453b78bafae5cb24a6b37b1eea50
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit e73f35d9c63378ed26e33f488a3ee5bb0745e9d5)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 19 insertions, 2 deletions

diff --git a/src/printsupport/dialogs/qprintdialog_mac.mm b/src/printsupport/dialogs/qprintdialog_mac.mm
index b1b56dbf54..fa4fac1884 100644
--- a/src/printsupport/dialogs/qprintdialog_mac.mm
+++ b/src/printsupport/dialogs/qprintdialog_mac.mm
@@ -238,8 +238,8 @@ void QPrintDialogPrivate::openCocoaPrintPanel(Qt::WindowModality modality)
         int rval = [printPanel runModalWithPrintInfo:printInfo];
         [delegate printPanelDidEnd:printPanel returnCode:rval contextInfo:q];
     } else {
-        Q_ASSERT(q->parentWidget());
-        QWindow *parentWindow = q->parentWidget()->windowHandle();
+        Q_ASSERT(q->window());
+        QWindow *parentWindow = q->window()->windowHandle();
         NSWindow *window = static_cast<NSWindow *>(qApp->platformNativeInterface()->nativeResourceForWindow("nswindow", parentWindow));
         [printPanel beginSheetWithPrintInfo:printInfo
                              modalForWindow:window
@@ -271,6 +271,7 @@ QPrintDialog::QPrintDialog(QWidget *parent)
 
 QPrintDialog::~QPrintDialog()
 {
+    hide();
 }
 
 int QPrintDialog::exec()
diff --git a/tests/auto/printsupport/dialogs/qabstractprintdialog/tst_qabstractprintdialog.cpp b/tests/auto/printsupport/dialogs/qabstractprintdialog/tst_qabstractprintdialog.cpp
index 8dcfab8e64..377226d5ac 100644
--- a/tests/auto/printsupport/dialogs/qabstractprintdialog/tst_qabstractprintdialog.cpp
+++ b/tests/auto/printsupport/dialogs/qabstractprintdialog/tst_qabstractprintdialog.cpp
@@ -24,6 +24,8 @@ private slots:
     void getSetCheck();
     void setMinMax();
     void setFromTo();
+
+    void hideNativeByDestruction();
 #endif
 };
 
@@ -135,6 +137,20 @@ void tst_QAbstractPrintDialog::setFromTo()
     QCOMPARE(obj1.maxPage(), 50);
 }
 
+void tst_QAbstractPrintDialog::hideNativeByDestruction()
+{
+#ifdef Q_OS_WINDOWS
+    QSKIP("This test fails on windows, the QPrintDialog::setVisible implementation blocks");
+#endif
+
+    QWidget window;
+    QWidget *child = new QWidget(&window);
+    QPointer<QPrintDialog> dialog = new QPrintDialog(child);
+    window.show();
+    QVERIFY(QTest::qWaitForWindowActive(&window));
+    dialog->open();
+}
+
 #endif
 
 QTEST_MAIN(tst_QAbstractPrintDialog)