Blender Git Commit Log

Darn editmesh code! Trying to prevent user error (add overlapping faces)
caused a myriad of other errors in tools... now you couldn't create a
triangle if one 1 edge was in a face already.

I should have known it should be coded differently. :)
So, here's another version, which actually restores the old code, and
only has the exception on pressing Fkey.