https://bugs.kde.org/show_bug.cgi?id=459829

Ralek Kolemios <i...@ralek.art> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|WAITINGFORINFO              |---
             Status|NEEDSINFO                   |REPORTED

--- Comment #3 from Ralek Kolemios <i...@ralek.art> ---
Unfortunately 5c98a and newer builds don't work on my system because of bug
#464255 , but it is still a problem on my last available working build of
8e8c855

I took a look at the code a while ago and it appears that every movement of the
mouse calls a function which 'repositions' the pen pressure readings onto the
new line as the user moves the preview around. Unfortunately because there is a
floor() in this function, and the positions are pulled from the last result of
the function, and it's called several hundred times a second, the pen pressure
readings naturally move up and to the left of the origin of the line as they
get rounded down constantly.

This effect isn't visible if you're not using pen pressure, and it becomes more
noticeable as canvas FPS increases.

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