795e63a4c7
Partial redrawing of the 3d viewport has not worked since the transition to 2.8. Despite this, we still calculate the paint BVH bounds of the affected area. To avoid this wasted work and simplify the code, we remove the related functions. Further work to enable partial redraws would not necessarily be integrated in the same way. Additionally, a minor speedup of 1.05x (1.00ms to 0.95ms) can be observed with this commit when performing weight painting on a mesh with 2 million elements. Similar to #136471 Pull Request: https://projects.blender.org/blender/blender/pulls/136912
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