Update of bug #18570 (project mypaint):
Status: None => Confirmed
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Follow-up Comment #1:
We do use the initial "non-clicked coordinate as the initial point" of
interpolation only if we don't get any motion events in-between. I assume this
is the issue, though (but you can check with Menu->Help->Debug->Test Input
Devices).
The "problem" is that we do slow position tracking (which is filtering of
your pointer position, which inheretly adds some delay) all the time even when
you can't see it because you have lifted your pen. You can visualize this by
increasing the "opacity multiply" value of your brush a little bit (the base
value), which allows you to see the stroke when you lifted the pen.
I know this problem for some time (it's not a big issue if you use only
moderate filtering) and I think the correct solution would be to make it
depend on pressure, eg. low pressure = almost no filtering. You can't create
this mapping at the moment because it's constant.
The "skips" that you see in image 2a have probably a completely different
cause. Please try to figure out what triggers them (maybe pressure reaching
the click threshold?). Check the console output (Help->Debug->Print brush
input values to stdout) for irregularities.
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