Fill between many LPE automatically added to clones + crash

[Hachmann]

When I open the path effect editor and click on + while a clone is selected, the 'fill between many' LPE is added automatically.
When the LPE is removed now, the clone gets a size of 0.

When instead of removing, I add another LPE, e.g. perspective/envelope (which seems to work, too, I can move the corners, and the image looks correct), then remove the 'fill between many' effect, Inkscape crashes with:

gsl: lu.c:147: ERROR: matrix is singular
Default GSL error handler invoked.

Emergency save activated!

Emergency save document locations:
  /home/username/New document 1.2018_02_13_17_35_54.0.svg
Emergency save completed. Inkscape will close now.
If you can reproduce this crash, please file a bug at www.inkscape.org
with a detailed description of the steps leading to the crash, so we can fix it.
Abgebrochen (Speicherabzug geschrieben)

This is with Inkscape 0.92.x (bcc9ce1, 2018-02-10).

[Patrick Storz (ede123)]

Have you tested the same in master? If I remember correctly this should already be fixed, see [1] for the relevant discussion and [2] for the MR that triggered it (you were actually commenting on that one).

Jabier probably knows best if it makes sense to backport a minimal fix to 0.92.x to avoid the crashing.

[1] http://inkscape.13.x6.nabble.com/Survey-Default-beabiour-on-clones-with-path-operations-td4981233.html
[2] https://gitlab.com/inkscape/inkscape/merge_requests/159

[Hachmann (marenhachmann)]

Ah, okay. I didn't follow that discussion closely, as I didn't really understand what you all were talking about at the time. As far as I was concerned, this was about boolops on clones, the LPE part didn't register.

Thank you.

Yes, fixing the crash would be helpful, but it's probably a very rare issue.

[Jabiertxof (jabiertxof)]

Is not fixed in trunk. Basicaly the LPE try to apply a LPE to a empty path with only a move to. I do a fix soon and backport it