It doesn't look like this fixed the test_axes3d_primary_views failure. Also note that we'll have to fix this on the v3.9.x branch too, so we might just have to bump the tolerance on that one.

This is a very welcome change. In the 3D plots especially there can be miniscule rendering differences between different platforms which are unrelated to code diffs and are extremely difficult to debug and get tests passing. Only real way I've found is to continuously push up to CI, wait 20 min for tests to run through, then download the image diffs on the failed platforms and enhance contrast in an image editing program (because the diff looks black initially since the diff is so small). Then invariably the fix is to tweak the test slightly and hope the rendering comes out the same. I've gone 10+ cycles of this workflow on some PRs.