QPA: Set focus reason when window activation changes focus

QApplication hides the fact that the reason is never set by several
QPA plugins, but Quick items don't receive the correct reason on
Windows, Android, the offscreen plugin, and other platforms.

Add relevant scenario to the QFocusEvent test case, and fix the
plugins to always set the focus reason when handling window activation
changes. Exclude the minimal plugin from the test, it seems largely
unmaintained anyway.

Task-number: QTBUG-75862
Change-Id: I5404a225b387fc9a3851b6968d0777c687127ed1
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit c034ad03ac6896b9fba8a72e01a1b7ec34cf0cd5)
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/auto/other/qfocusevent/tst_qfocusevent.cpp b/tests/auto/other/qfocusevent/tst_qfocusevent.cpp
index cd00f4cc9c..92ab429d4a 100644
--- a/tests/auto/other/qfocusevent/tst_qfocusevent.cpp
+++ b/tests/auto/other/qfocusevent/tst_qfocusevent.cpp
@@ -369,6 +369,42 @@ void tst_QFocusEvent::checkReason_ActiveWindow()
     QVERIFY( childFocusWidgetOne->hasFocus() );
     QVERIFY( childFocusWidgetOne->focusInEventRecieved );
     QCOMPARE( childFocusWidgetOne->focusInEventReason, (int)Qt::ActiveWindowFocusReason);
+
+    const bool windowActivationReasonFail =
+        QGuiApplication::platformName().toLower() == "minimal";
+
+    struct Window : public QWindow
+    {
+        Qt::FocusReason lastReason = Qt::NoFocusReason;
+    protected:
+        void focusInEvent(QFocusEvent *event) override
+        {
+            lastReason = event->reason();
+        }
+        void focusOutEvent(QFocusEvent *event) override
+        {
+            lastReason = event->reason();
+        }
+    };
+
+    Window window;
+    window.show();
+    window.requestActivate();
+    QVERIFY(QTest::qWaitForWindowActive(&window));
+
+    if (windowActivationReasonFail)
+        QEXPECT_FAIL("", "Platform doesn't set window activation reason for QWindow", Continue);
+    QCOMPARE(window.lastReason, Qt::ActiveWindowFocusReason);
+    window.lastReason = Qt::NoFocusReason;
+
+    Window window2;
+    window2.show();
+    window2.requestActivate();
+    QVERIFY(QTest::qWaitForWindowActive(&window2));
+
+    if (windowActivationReasonFail)
+        QEXPECT_FAIL("", "Platform doesn't set window activation reason for QWindow", Continue);
+    QCOMPARE(window.lastReason, Qt::ActiveWindowFocusReason);
 }