render
When adjusting settings for world textures (with Both/World preview modes),
every tweak would result in the usercount of the texture increasing. As a
result, before long the texture would claim to have over 100 users. Fortunately,
this only appeared to be just a cosmetic issue (i.e. no real memory leak here),
though it was a bit unsettling.
NOTE: this is still a bit glitchy, as now we have flickering when updating
texture settings - the texture still temporarily has a second user during
preview rendering.
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