09eb4fe19a
The ear clipping method used by polyfill_2d only excluded concave ears which meant ears exactly co-linear edges created zero area triangles even when convex ears are available. While polyfill_2d prioritizes performance over *pretty* results, there is no need to pick degenerate triangles with other candidates are available. As noted in code-comments, callers that require higher quality tessellation should use BLI_polyfill_beautify.
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