Skip proxy widgets that can't take focus when (back)tabbing

Fixes regression introduced in b4981f9d4ca914c6ecaa49bfdd69e51806a3671a,
due to which it was possible to back-tab into a widget even though it or
its focusProxy had a NoFocus policy.

As a drive-by, split the complicated if-statement up a bit for improved
readability.

Change-Id: Ib0ac2604076e812e340b11534c23ae8ae958d082
Fixes: QTBUG-76924
Pick-to: 5.15 5.12
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index c029e58acc..5aefc0f7f6 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -186,6 +186,7 @@ private slots:
     void reverseTabOrder();
     void tabOrderWithProxy();
     void tabOrderWithCompoundWidgets();
+    void tabOrderWithCompoundWidgetsNoFocusPolicy();
     void tabOrderNoChange();
     void tabOrderNoChange2();
     void appFocusWidgetWithFocusProxyLater();
@@ -2124,6 +2125,51 @@ static void dumpFocusChain(QWidget *start, bool bForward, const char *desc = nul
 #endif
 }
 
+void tst_QWidget::tabOrderWithCompoundWidgetsNoFocusPolicy()
+{
+    Container container;
+    container.setWindowTitle(QLatin1String(QTest::currentTestFunction()));
+    QSpinBox spinbox1;
+    spinbox1.setObjectName("spinbox1");
+    QSpinBox spinbox2;
+    spinbox2.setObjectName("spinbox2");
+    QSpinBox spinbox3;
+    spinbox3.setObjectName("spinbox3");
+
+    spinbox1.setFocusPolicy(Qt::StrongFocus);
+    spinbox2.setFocusPolicy(Qt::NoFocus);
+    spinbox3.setFocusPolicy(Qt::StrongFocus);
+    container.box->addWidget(&spinbox1);
+    container.box->addWidget(&spinbox2);
+    container.box->addWidget(&spinbox3);
+
+    container.show();
+    container.activateWindow();
+
+    QApplication::setActiveWindow(&container);
+    if (!QTest::qWaitForWindowActive(&container))
+        QSKIP("Window failed to activate, skipping test");
+
+    QVERIFY2(spinbox1.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    container.tab();
+    QVERIFY2(!spinbox2.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    QVERIFY2(spinbox3.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    container.tab();
+    QVERIFY2(spinbox1.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    container.backTab();
+    QVERIFY2(spinbox3.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    container.backTab();
+    QVERIFY2(!spinbox2.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+    QVERIFY2(spinbox1.hasFocus(),
+             qPrintable(QApplication::focusWidget()->objectName()));
+}
+
 void tst_QWidget::tabOrderNoChange()
 {
     QWidget w;