[Bf-committers] Undo issue with realtime textures

[Alexander Ewering]

I just wanted to point out that Undo is insanely slow when you have
realtime textures loaded, as it re-uploads the textures to the graphics
card on each Undo.

It should probably skip this step, if possible.

With a very simple scene, just a few planes and textures on them, Undo
takes 5 seconds because of the re-uploading.

| alexander ewering              instinctive mediaworks
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