Follow-up Comment #9, bug #19896 (project mypaint):
I saw something like that once with the wacom touchpad strip, whenever you
touch it accidentally. Have you tried to plug out and/or disable all mice-like
devices, like touchpads or scroll stripes? Try triggering all of them to see
if they cause the bug.
If you just want a workaround, hack something like
if event.x_root == 0 and event.y_root == 0: return
into the code. Obviously this will result in a glitch when somebody with a
non-broken tablet driver really paints at that coordinate. Those kind of bugs
are really GTK+ or tablet driver bugs 99% of the time. If you want to find a
proper fix you have to hunt the problem down yourself on your system, chances
that somebody else will figure it out are small. In MyPaint we can only make
dirty workarounds.
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