diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 08ff712..7ddc52c 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1304,13 +1304,18 @@ void QWindowsWindow::releaseDC()
 }
 
 bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
-                                         WPARAM, LPARAM)
+                                         WPARAM w, LPARAM l)
 {
+    qDebug() << __FUNCTION__ << message << w << l;
     // Ignore invalid update bounding rectangles
-    if (!GetUpdateRect(m_data.hwnd, 0, FALSE))
+    if (!GetUpdateRect(m_data.hwnd, 0, FALSE)) {
+        qDebug() << __FUNCTION__ << "returns GetUpdateRect";
         return false;
-    if (message == WM_ERASEBKGND) // Backing store - ignored.
+    }
+    if (message == WM_ERASEBKGND) { // Backing store - ignored.
+        qDebug() << __FUNCTION__ << "returns WM_ERASEBKGND";
         return true;
+    }
     PAINTSTRUCT ps;
 
     // Observed painting problems with Aero style disabled (QTBUG-7865).
@@ -1322,7 +1327,9 @@ bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
     // If the a window is obscured by another window (such as a child window)
     // we still need to send isExposed=true, for compatibility.
     // Our tests depend on it.
-    fireExpose(QRegion(qrectFromRECT(ps.rcPaint)), true);
+    const QRect r = qrectFromRECT(ps.rcPaint);
+    qDebug() <<__FUNCTION__ <<  r;
+    fireExpose(QRegion(r), true);
     if (!QWindowsContext::instance()->asyncExpose())
         QWindowSystemInterface::flushWindowSystemEvents();