Fix leftover faces after vertex merge

[farfalk]

As per title. The bug happens everytime you make a face "disappear" through collapsing two-by-two the vertices sorrounding it: check the video below. Ignore the "mirroring" activation: I was looking for another bug when I found this!

8mb.video-lS5-mxUAuW2L.mp4

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[JannisX11]

Good catch, would need to be implemented differently though. Currently this clears all 2-vertex faces from the mesh, even if they are somewhere else in the model. So this would need to check if the vertices were modified, and if the leftover edge overlaps with an existing face.

[farfalk]

Good catch, would need to be implemented differently though. Currently this clears all 2-vertex faces from the mesh, even if they are somewhere else in the model. So this would need to check if the vertices were modified, and if the leftover edge overlaps with an existing face.

Sorry for the delay in responding. Just here to report that this still happens in 4.9.4.

Unfortunately I don't really know how to proceed :(