Xnest: directly pass ClearArea request to upstream server

Instead of going through mi machinery, just pass the ClearArea
request to the upstream window.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

hw/xnest/Screen.c

@@ -308,6 +308,7 @@ xnestOpenScreen(ScreenPtr pScreen, int argc, char *argv[])
     pScreen->WindowExposures = xnestWindowExposures;
     pScreen->CopyWindow = xnestCopyWindow;
     pScreen->ClipNotify = xnestClipNotify;
+    pScreen->ClearToBackground = xnest_screen_ClearToBackground;
 
     /* Pixmap procedures */
 

hw/xnest/Window.c

@@ -520,3 +520,11 @@ xnestShapeWindow(WindowPtr pWin)
         }
     }
 }
+
+void xnest_screen_ClearToBackground(WindowPtr pWin, int x, int y, int w, int h, Bool generateExposures)
+{
+    xcb_clear_area(xnestUpstreamInfo.conn,
+                   generateExposures,
+                   xnestWindow(pWin),
+                   x, y, w, h);
+}

hw/xnest/XNWindow.h

@@ -69,4 +69,7 @@ void xnestWindowExposures(WindowPtr pWin, RegionPtr pRgn);
 void xnestSetShape(WindowPtr pWin, int kind);
 void xnestShapeWindow(WindowPtr pWin);
 
+/* ScreenRec operations */
+void xnest_screen_ClearToBackground(WindowPtr pWin, int x, int y, int w, int h, Bool generateExposures);
+
 #endif                          /* XNESTWINDOW_H */