PowerStroke: drawn stroke 'jumps' when moving a knot

[Hachmann]

This happens in master (0.92+devel (458da60, 2018-01-08)) as well as in the released version.

When a powerstroke knot is moved, sometimes the stroke does not follow the knot to its new position, and instead jumps to a different position. This is more prominent with just one knot, and on non-smooth paths (as far as I could find).

This makes it difficult to impossible to get the stroke width that one wants in many cases.

(Actually, this is a very old issue, I've only never bothered to report)

Video: demonstrated from second 25 to 47.

[Jabiertxof (jabiertxof)]

Is because original path is too comlex and happends in some types of interpolation. Seems hard to fix in a high level. Need a 2Geom work.

[Jabiertxof (jabiertxof)]

Also we can so a simplify to the original path, whats your opinion?

[Hachmann (marenhachmann)]

I don't really know, sorry. Depends on what it would look like. Probably for many cases that would be a viable solution.