[PATCH v2 0/4] MR8958: win32u: Fixes for the OpenGL drawables mess.

[Rémi Bernon]

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  v2: win32u: Don't store the window OpenGL drawables on the DCs.
      win32u: Keep a separate pointer for unused opengl drawable.
      win32u: Rename window opengl drawable to current_drawable.
      win32u: Introduce an context_exchange_drawables helper.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/8958