Fixed a crash in menubar with invisible actions

That would happen because the loop to find the next action when
navigating with the keyboard was not good enough.

Task-number: QTBUG-11823
(cherry picked from commit 8ea60a39a8c4661db505a6dc1342e524ec2e460c)

2 files changed, 30 insertions, 1 deletions

diff --git a/src/gui/widgets/qmenubar.cpp b/src/gui/widgets/qmenubar.cpp
index 5776565..82848b3 100644
--- a/src/gui/widgets/qmenubar.cpp
+++ b/src/gui/widgets/qmenubar.cpp
@@ -768,7 +768,7 @@ QAction *QMenuBarPrivate::getNextAction(const int _start, const int increment) c
     const int start = (_start == -1 && increment == -1) ? actions.count() : _start;
     const int end =  increment == -1 ? 0 : actions.count() - 1;
 
-    for (int i = start; start != end;) {
+    for (int i = start; i != end;) {
         i += increment;
         QAction *current = actions.at(i);
         if (!actionRects.at(i).isNull() && (allowActiveAndDisabled || current->isEnabled()))
diff --git a/tests/auto/qmenubar/tst_qmenubar.cpp b/tests/auto/qmenubar/tst_qmenubar.cpp
index 2033bfa..35dc770 100644
--- a/tests/auto/qmenubar/tst_qmenubar.cpp
+++ b/tests/auto/qmenubar/tst_qmenubar.cpp
@@ -168,6 +168,7 @@ private slots:
     void task256322_highlight();
     void menubarSizeHint();
     void taskQTBUG4965_escapeEaten();
+    void taskQTBUG11823_crashwithInvisibleActions();
 
 #if defined(QT3_SUPPORT)
     void indexBasedInsertion_data();
@@ -1690,6 +1691,34 @@ void tst_QMenuBar::taskQTBUG4965_escapeEaten()
     QTRY_VERIFY(!menubar.isVisible());
 }
 
+void tst_QMenuBar::taskQTBUG11823_crashwithInvisibleActions()
+{
+    QMenuBar menubar;
+    menubar.setNativeMenuBar(false); //we can't check the geometry of native menubars
+
+    QAction * m = menubar.addAction( "&m" );
+    QAction * a = menubar.addAction( "&a" );
+
+    menubar.show();
+    QApplication::setActiveWindow(&menubar);
+    QTest::qWaitForWindowShown(&menubar);
+    menubar.setActiveAction(m);
+    QCOMPARE(menubar.activeAction(), m);
+    QTest::keyClick(0, Qt::Key_Right);
+    QCOMPARE(menubar.activeAction(), a);
+    QTest::keyClick(0, Qt::Key_Right);
+    QCOMPARE(menubar.activeAction(), m);
+    a->setVisible(false);
+
+    menubar.setActiveAction(m);
+    QCOMPARE(menubar.activeAction(), m); //the active action shouldn't have changed
+
+    //it used to crash here because the action is invisible
+    QTest::keyClick(0, Qt::Key_Right);
+    QCOMPARE(menubar.activeAction(), m); //the active action shouldn't have changed
+}
+
+
 #if defined(QT3_SUPPORT)
 void tst_QMenuBar::indexBasedInsertion_data()
 {