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When triangulating meshes, the UV unwrapper was previously using a heuristic to split quads into triangles. If one of the internal angles is greater than 180degrees, a so-called "reflex angle", the heuristic was giving a poor choice of split. Instead of using a special case for quads, this change routes everything through the generic n-gon `BLI_polyfill_beautify` method instead. Reviewed By: Brecht Van Lommel Differential Revision: https://developer.blender.org/D16505