Comment 1 for bug 171676

this does not only happen at the beginning.
it happens every time the drawing speed gets very slow.
(at the beginning and the end of strokes, and on sharp corners, 90 degrees or more)
the most extreme case is just holding the pen down:
every jitter is taken as a drawing action in a basically random direction, creating the mess.
(this effect may be restricted to certain driver/os versions, i'm on windows)

this is especially annoying since it triggers bug 184550.

it would be nice if the tool would sanity check the input to distinguish between noise and real input. maybe a tolerance value (like in the freehand tool) would do.