Fix missing emission of QClipboard::selectionChanged

And add a test to verify we've fixed it.

Change-Id: Ic6d5e64b3000444465935f7caf7e32ec9c4f1012
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

src/plugins/platforms/wayland/qwaylandprimaryselectionv1.cpp

@@ -96,6 +96,15 @@ QWaylandPrimarySelectionDeviceV1::~QWaylandPrimarySelectionDeviceV1()
     destroy();
 }
 
+void QWaylandPrimarySelectionDeviceV1::invalidateSelectionOffer()
+{
+    if (!m_selectionOffer)
+        return;
+
+    m_selectionOffer.reset();
+    QGuiApplicationPrivate::platformIntegration()->clipboard()->emitChanged(QClipboard::Selection);
+}
+
 void QWaylandPrimarySelectionDeviceV1::setSelectionSource(QWaylandPrimarySelectionSourceV1 *source)
 {
     if (source) {

src/plugins/platforms/wayland/qwaylandprimaryselectionv1_p.h

@@ -125,7 +125,7 @@ class QWaylandPrimarySelectionDeviceV1 : public QObject, public QtWayland::zwp_p
 public:
     ~QWaylandPrimarySelectionDeviceV1() override;
     QWaylandPrimarySelectionOfferV1 *selectionOffer() const { return m_selectionOffer.data(); }
-    void invalidateSelectionOffer() { m_selectionOffer.reset(); }
+    void invalidateSelectionOffer();
     QWaylandPrimarySelectionSourceV1 *selectionSource() const { return m_selectionSource.data(); }
     void setSelectionSource(QWaylandPrimarySelectionSourceV1 *source);
 

tests/auto/wayland/primaryselectionv1/tst_primaryselectionv1.cpp

@@ -261,6 +261,7 @@ private slots:
     void pasteAscii();
     void pasteUtf8();
     void destroysPreviousSelection();
+    void destroysSelectionOnLeave();
     void copy();
 };
 
@@ -411,6 +412,35 @@ void tst_primaryselectionv1::destroysPreviousSelection()
     QCOMPOSITOR_TRY_COMPARE(primarySelectionDevice()->m_sentSelectionOffers.size(), 1);
 }
 
+void tst_primaryselectionv1::destroysSelectionOnLeave()
+{
+    QRasterWindow window;
+    window.resize(64, 64);
+    window.show();
+    QCOMPOSITOR_TRY_VERIFY(xdgSurface() && xdgSurface()->m_committedConfigureSerial);
+
+    exec([&] {
+        auto *surface = xdgSurface()->m_surface;
+        keyboard()->sendEnter(surface); // Need to set keyboard focus according to protocol
+
+        auto *offer = primarySelectionDevice()->sendDataOffer({"text/plain"});
+        primarySelectionDevice()->sendSelection(offer);
+    });
+
+    QTRY_VERIFY(QGuiApplication::clipboard()->mimeData(QClipboard::Selection));
+    QTRY_VERIFY(QGuiApplication::clipboard()->mimeData(QClipboard::Selection)->hasText());
+
+    QSignalSpy selectionChangedSpy(QGuiApplication::clipboard(), &QClipboard::selectionChanged);
+
+    exec([&] {
+        auto *surface = xdgSurface()->m_surface;
+        keyboard()->sendLeave(surface);
+    });
+
+    QTRY_COMPARE(selectionChangedSpy.count(), 1);
+    QVERIFY(!QGuiApplication::clipboard()->mimeData(QClipboard::Selection)->hasText());
+}
+
 void tst_primaryselectionv1::copy()
 {
     class Window : public QRasterWindow {