gdiplus: GdipDeleteGraphics affected by busy state too. Test added.

dlls/gdiplus/graphics.c

@@ -889,6 +889,8 @@ GpStatus WINGDIPAPI GdipCreateStreamOnFile(GDIPCONST WCHAR * filename,
 GpStatus WINGDIPAPI GdipDeleteGraphics(GpGraphics *graphics)
 {
     if(!graphics) return InvalidParameter;
+    if(graphics->busy) return ObjectBusy;
+
     if(graphics->hwnd)
         ReleaseDC(graphics->hwnd, graphics->hdc);
 

dlls/gdiplus/tests/graphics.c

@@ -714,6 +714,9 @@ static void test_Get_Release_DC(void)
     status = GdipMultiplyWorldTransform(graphics, m, MatrixOrderPrepend);
     status = GdipGetClip(graphics, region);
     expect(ObjectBusy, status); status = Ok;
+    /* try to delete before release */
+    status = GdipDeleteGraphics(graphics);
+    expect(ObjectBusy, status);
 
     status = GdipReleaseDC(graphics, retdc);
     expect(Ok, status);