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
Pick-to: 6.2 5.15
Change-Id: Ic9fa3d84b6ee84ae5f8fa2408b0d60e35dbfa328
Reviewed-by: André de la Rocha <andre.rocha@qt.io>

2 files changed, 13 insertions, 3 deletions

diff --git a/src/plugins/platforms/windows/qwindowsmousehandler.cpp b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
index 174fe7a181..9fc04da245 100644
--- a/src/plugins/platforms/windows/qwindowsmousehandler.cpp
+++ b/src/plugins/platforms/windows/qwindowsmousehandler.cpp
@@ -258,8 +258,13 @@ 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"
@@ -476,7 +481,7 @@ bool QWindowsMouseHandler::translateMouseEvent(QWindow *window, HWND hwnd,
     }
 
     if (!discardEvent && mouseEvent.type != QEvent::None) {
-        QWindowSystemInterface::handleMouseEvent(window, device, winEventPosition, globalPosition, buttons,
+        QWindowSystemInterface::handleMouseEvent(window, device, clientPosition, globalPosition, buttons,
                                                  mouseEvent.button, mouseEvent.type,
                                                  keyModifiers, source);
     }
diff --git a/src/plugins/platforms/windows/qwindowspointerhandler.cpp b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
index 24d85c76e6..46fbfcc8d6 100644
--- a/src/plugins/platforms/windows/qwindowspointerhandler.cpp
+++ b/src/plugins/platforms/windows/qwindowspointerhandler.cpp
@@ -768,8 +768,13 @@ bool QWindowsPointerHandler::translateMouseEvent(QWindow *window,
         globalPos = eventPos;
         localPos = QWindowsGeometryHint::mapFromGlobal(hwnd, eventPos);
     } else {
-        localPos = eventPos;
         globalPos = QWindowsGeometryHint::mapToGlobal(hwnd, eventPos);
+        auto targetHwnd = hwnd;
+        if (auto *pw = window->handle())
+            targetHwnd = HWND(pw->winId());
+        localPos = targetHwnd == hwnd
+            ? eventPos
+            : QWindowsGeometryHint::mapFromGlobal(targetHwnd, globalPos);
     }
 
     const Qt::KeyboardModifiers keyModifiers = QWindowsKeyMapper::queryKeyboardModifiers();