Windows QPA: Fix mouse event position for QWindows with Qt::WindowTransparentForInput

The local position needs to be corrected when the Qt receiver window
does not correspond to the native event receiver window.

Fixes: QTBUG-97095
Change-Id: Ic9fa3d84b6ee84ae5f8fa2408b0d60e35dbfa328
Reviewed-by: André de la Rocha <andre.rocha@qt.io>
(cherry picked from commit 36a6d17af00cf6b2ed4160194b1861208dcdd616)

1 files changed, 7 insertions, 2 deletions

diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index 73e2adcd13..854d548523 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -280,8 +280,13 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
         globalPosition = winEventPosition;
         clientPosition = QWindowsGeometryHint::mapFromGlobal(hwnd, globalPosition);
     } else {
-        clientPosition = winEventPosition;
         globalPosition = QWindowsGeometryHint::mapToGlobal(hwnd, winEventPosition);
+        auto targetHwnd = hwnd;
+        if (auto *pw = window->handle())
+            targetHwnd = HWND(pw->winId());
+        clientPosition = targetHwnd == hwnd
+            ? winEventPosition
+            : QWindowsGeometryHint::mapFromGlobal(targetHwnd, globalPosition);
     }
 
     // Windows sends a mouse move with no buttons pressed to signal "Enter"
@@ -494,7 +499,7 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
     }
 
     if (!discardEvent && mouseEvent.type != QEvent::None) {
-        QWindowSystemInterface::handleMouseEvent(window, winEventPosition, globalPosition, buttons,
+        QWindowSystemInterface::handleMouseEvent(window,clientPosition, globalPosition, buttons,
                                                  mouseEvent.button, mouseEvent.type,
                                                  keyModifiers, source);
     }