Clip negative

TODO

@@ -1,4 +1,4 @@
-* Continue rebasing from e3b13a3923cbe3e46c231b4f2817d2f0cabb58f9
+* Continue rebasing from 98d94808f26240a1e7af77513a146cc9c2a870fd
 * Add a focus listener interface.
 * Make focus apply synchronously.
 * Graphics and input objects for DirectX.

src/graphics.cpp

@@ -74,6 +74,14 @@ namespace gcn
 
     bool Graphics::pushClipArea(Rectangle area)
     {
+        // Ignore area with a negative width or height
+        // by simple pushing an empty clip area to the stack.
+        if (area.width < 0 || area.height < 0)
+        {
+            ClipRectangle carea;
+            mClipStack.push(carea);
+            return true;
+        }
         if (mClipStack.empty())
         {
             ClipRectangle carea;