Incorrect mouse coordinates used when compressing WM_MOUSEMOVE messages.

Use the coordinates passed in the LPARAM parameter, the pt passed with
the MSG is not always correct.

Task-number: QTBUG-7637
Reviewed-by: Denis
(cherry picked from commit 234e849cfc85d5618d2f703bb92701042993d2de)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/gui/kernel/qapplication_win.cpp b/src/gui/kernel/qapplication_win.cpp
index aed6d02f65..4d30e20bc1 100644
--- a/src/gui/kernel/qapplication_win.cpp
+++ b/src/gui/kernel/qapplication_win.cpp
@@ -2982,7 +2982,10 @@ bool QETWidget::translateMouseEvent(const MSG &msg)
                 // most recent one.
                 msgPtr->lParam = mouseMsg.lParam;
                 msgPtr->wParam = mouseMsg.wParam;
-                msgPtr->pt = mouseMsg.pt;
+                // Extract the x,y coordinates from the lParam as we do in the WndProc
+                msgPtr->pt.x = GET_X_LPARAM(mouseMsg.lParam);
+                msgPtr->pt.y = GET_Y_LPARAM(mouseMsg.lParam);
+                ClientToScreen(msg.hwnd, &(msgPtr->pt));
                 // Remove the mouse move message
                 PeekMessage(&mouseMsg, msg.hwnd, WM_MOUSEMOVE,
                             WM_MOUSEMOVE, PM_REMOVE);