Index: win32ss/user/ntuser/window.c
===================================================================
--- win32ss/user/ntuser/window.c	(revision 62321)
+++ win32ss/user/ntuser/window.c	(working copy)
@@ -2313,6 +2313,17 @@
                         ParentWindow->rcClient.top);
    }
 */
+   /* correct child window coordinates if mirroring on parent is enabled */
+    if (ParentWindow != NULL)
+    {
+        if ( ((Cs->style & WS_CHILD) == WS_CHILD) && 
+            ((ParentWindow->ExStyle & WS_EX_LAYOUTRTL) ==  WS_EX_LAYOUTRTL))
+        {
+            Window->rcWindow.right = ParentWindow->rcClient.right - (Window->rcWindow.left - ParentWindow->rcClient.left);
+            Window->rcWindow.left = Window->rcWindow.right - Size.cx;
+        }
+    }
+
    Window->rcClient = Window->rcWindow;
 
    /* Link the window */
Index: win32ss/user/user32/windows/winpos.c
===================================================================
--- win32ss/user/user32/windows/winpos.c	(revision 62321)
+++ win32ss/user/user32/windows/winpos.c	(working copy)
@@ -218,8 +218,6 @@
        Delta.y -= ToWnd->rcClient.top;
     }
 
-    if (mirror_from) Delta.x = -Delta.x;
-
     for (i = 0; i != cPoints; i++)
     {
         lpPoints[i].x += Delta.x;