winrt: Fix mouse releases that happen outside a window

If the mouse button is released outside of a window,
we did not trigger a mouse release event.

Task-number: QTBUG-66088
Change-Id: I3ef6234cc922c8c59ac3aa6350783fae4ba36bda
Reviewed-by: Andre de la Rocha <andre.rocha@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/plugins/platforms/winrt/qwinrtscreen.cpp b/src/plugins/platforms/winrt/qwinrtscreen.cpp
index 1a5af22814..97e54d496a 100644
--- a/src/plugins/platforms/winrt/qwinrtscreen.cpp
+++ b/src/plugins/platforms/winrt/qwinrtscreen.cpp
@@ -1215,6 +1215,12 @@ HRESULT QWinRTScreen::onPointerUpdated(ICoreWindow *, IPointerEventArgs *args)
             QWindowSystemInterface::handleMouseEvent(d->currentPressWindow, localPressPos, pos, buttons, mods);
             d->currentPressWindow = nullptr;
         }
+        // If the mouse button is released outside of a window, targetWindow is 0, but the event
+        // has to be delivered to the window, that initially received the mouse press.
+        if (buttons == Qt::NoButton && d->currentPressWindow && !targetWindow) {
+            targetWindow = d->currentPressWindow;
+            d->currentPressWindow = nullptr;
+        }
 
         QWindowSystemInterface::handleMouseEvent(targetWindow, localPos, pos, buttons, mods);