G2 circle to G1 transition sometimes results in extraneous extrusions

[clemtaylor]

I'm using the git build on an Ultimaker. I've been playing around with G2 circles (where starting and ending position are the same) and I've made some nice cylinder test objects that print perfectly. But all the G1 commands where small without any Es with the G1s. But when I mix G2 circles and lines or longer moves I sometimes see sudden fast rotations of the extruder gear at the transition from circles to G1 (moves or extrudes). I think this might be some sort of residual E value or somehow related to the command lookahead. I did some tests setting the feed rate exactly once and to a slow value and still saw a sudden fast rotation of the extruder.

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