Check if WINED3DRS_VERTEXBLEND is dirty in transform_world

[Henri Verbeet]

2009/7/5 Lisa Denia <eiffel56 at gmail.com>:
> This fixes the flickering cursor mentioned in Bug
> #14375(http://bugs.winehq.org/show_bug.cgi?id=14375).
> The cursor flickers because the scene gets rendered twice a draw, which is
> known and expected. The cursor is not one of that usual animated 2d things,
> but a 3d object. So, in every draw, the scene gets rendered, the cursor gets
> rendered, and the scene gets rendered again. The attached patch checks for
> that special case.
>
It's not entirely clear to me why this should work.