Assert failure when setting a widget focus proxy as its successor in tab order

Now we check that and skip it from the tab list. Auto-test included.

Reviewed-by: leo
Task-number: QTBUG-7532
(cherry picked from commit 94f5f21ac88de0d940d6ac27d222f1ef8e66d939)

2 files changed, 16 insertions, 0 deletions

diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 73304c8..5c2015a 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -6414,6 +6414,8 @@ void QWidget::setTabOrder(QWidget* first, QWidget *second)
         first = fp;
     }
 
+    if (fp == second)
+        return;
 
     if (QWidget *sp = second->focusProxy())
         second = sp;
diff --git a/tests/auto/qwidget/tst_qwidget.cpp b/tests/auto/qwidget/tst_qwidget.cpp
index ea90ae3..1fb323e 100644
--- a/tests/auto/qwidget/tst_qwidget.cpp
+++ b/tests/auto/qwidget/tst_qwidget.cpp
@@ -396,6 +396,8 @@ private slots:
     void focusProxyAndInputMethods();
     void scrollWithoutBackingStore();
 
+    void taskQTBUG_7532_tabOrderWithFocusProxy();
+
 private:
     bool ensureScreenSize(int width, int height);
     QWidget *testWidget;
@@ -9783,5 +9785,17 @@ void tst_QWidget::scrollWithoutBackingStore()
     QCOMPARE(child.pos(),QPoint(25,25));
 }
 
+void tst_QWidget::taskQTBUG_7532_tabOrderWithFocusProxy()
+{
+    QWidget w;
+    w.setFocusPolicy(Qt::TabFocus);
+    QWidget *fp = new QWidget(&w);
+    fp->setFocusPolicy(Qt::TabFocus);
+    w.setFocusProxy(fp);
+    QWidget::setTabOrder(&w, fp);
+
+    // No Q_ASSERT, then it's allright.
+}
+
 QTEST_MAIN(tst_QWidget)
 #include "tst_qwidget.moc"