d282b1735e
Part of #118145. Instead of storing a separately allocated array for each BVH node for the temporary "color buffer" colors meant for mixing during a stroke, just store an array the size of the whole mesh. Though this is wasteful in terms of memory usage, plenty of other brushes store mesh-sized arrays already, and it should make more sense as BVH nodes get smaller too. After this commit, the BVH tree has no specific code for color attributes anymore.
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