Send leave/enter pointer event when starting/stoping effect mouse interception

When starting effect mouse interception the current focused window
and or decoration should get a leave event. Similar when the effect mouse
interception ends the current pointer position needs to be evaluated and
a pointer enter be sent if needed.

autotests/wayland/pointer_input.cpp

@@ -909,7 +909,6 @@ void PointerInputTest::testEffectOverrideCursorImage()
     const QImage openHand = p->cursorImage();
     QVERIFY(!openHand.isNull());
     QVERIFY(openHand != fallback);
-    QEXPECT_FAIL("", "Fix me", Continue);
     QVERIFY(leftSpy.wait());
 
     // let's change to arrow cursor, this should be our fallback
@@ -924,7 +923,6 @@ void PointerInputTest::testEffectOverrideCursorImage()
     Cursor::setPos(800, 800);
     // and end the override, which should switch to fallback
     effects->stopMouseInterception(effect.data());
-    QEXPECT_FAIL("", "Fix me", Continue);
     QCOMPARE(p->cursorImage(), fallback);
 
     // start mouse interception again
@@ -938,7 +936,6 @@ void PointerInputTest::testEffectOverrideCursorImage()
 
     // after ending the interception we should get an enter event
     effects->stopMouseInterception(effect.data());
-    QEXPECT_FAIL("", "Fix me", Continue);
     QVERIFY(enteredSpy.wait());
     QVERIFY(p->cursorImage().isNull());
 }

input.cpp

@@ -1022,6 +1022,10 @@ Toplevel *InputRedirection::findToplevel(const QPoint &pos)
     const bool isScreenLocked = waylandServer() && waylandServer()->isScreenLocked();
     // TODO: check whether the unmanaged wants input events at all
     if (!isScreenLocked) {
+        // if an effect overrides the cursor we don't have a window to focus
+        if (effects && static_cast<EffectsHandlerImpl*>(effects)->isMouseInterception()) {
+            return nullptr;
+        }
         const UnmanagedList &unmanaged = Workspace::self()->unmanagedList();
         foreach (Unmanaged *u, unmanaged) {
             if (u->geometry().contains(pos) && acceptsInput(u, pos)) {

pointer_input.cpp

@@ -487,6 +487,8 @@ void PointerInputRedirection::setEffectsOverrideCursor(Qt::CursorShape shape)
     if (!m_inited) {
         return;
     }
+    // current pointer focus window should get a leave event
+    update();
     m_cursor->setEffectsOverrideCursor(shape);
 }
 
@@ -495,6 +497,8 @@ void PointerInputRedirection::removeEffectsOverrideCursor()
     if (!m_inited) {
         return;
     }
+    // cursor position might have changed while there was an effect in place
+    update();
     m_cursor->removeEffectsOverrideCursor();
 }