Distortions at the end of lines made with the drawing tool

[Gilraiser]

Describe the bug
The drawing tool generates a distortion at the end of the drawing that is made. The error occurs when the contour, region and advanced contour options are activated, whether they are used alone or at the same time.

To Reproduce
Steps to reproduce the behavior:

1. Click on the drawing tool.
2. Draw any shape with long click.
3. Finish the form by releasing the click.
4. The error can be seen at the end of the line in the drawing.

Expected behavior
It is true that, depending on the modifications that the tool has had, certain variations to what is drawn are expected, such as smoothness. But you would expect the tangent and vertex handles to not get so tangled in the end.

Screenshots

DrawingToolBug2021-11-29.mp4

System information:

• OS: Arch Linux x64
• Commit ID: 0ab9d69

Additional comments
I hope the information is useful for everyone.
Thanks for the excellent work :)

[rodolforg]

@Gilraiser do you stay up-to-date via git?
Can you remember when this problem started?
Are you able to git-bisect?

[rodolforg]

via git-log, maybe until this commit, everything could be normal: c3e196e
After it, we made some cleanups that maybe broke it: like feb62c5 4bb7366 2ce7109

[Gilraiser]

Hello, best regards. I'm sure it started with commit 0ab9d69. I only have experience with git running git clone. Searching the internet, I see that git-bisect is for searching within code when programmers are not sure when the error started. I am very sure that it is in the commit that I have just pointed out where the error started. I reported it immediately as soon as it happened.

[rodolforg]

Yes, git-bisect help us to search the culprit commit.
We say to git what commit we are sure something was good and what commit is in a bad state (normally head commit).
Then it starts checking out the commit in the midway: we build and test and tell if it is a good or a bad commit. Then git checks out other commit, narrowing the search. We keep doing it until it finds a good commit followed by a bad one :)

Anyway, I'll investigate the commit you mentioned. Thank you :)

[genete]

Issue reappear in SynfigStudio-1.4.4-2022.12.25-osx-b8d62 using MacOS 10.13.6 (17G14042)