I found this oddity while playing with inkscape tonight:
Draw path AB and end it by pressing enter
Press 'a' to add nodes
Draw path from node B to new node C then back to B and press enter
What you end up with is a path ABCA (triangle shape) instead of ABCB. You
actually see the path jump from B to A when you finish it.
This was from CVS checked out about 10:00 EST.
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