Convert t + q to t + t in more cases

[KTibow]

Is your feature request related to a problem? Please describe.
Right now the "t + q -> t + t" conversion only converts it when there's two curves with the same delta. It doesn't account that t can be used in more cases, like where it reflects properly.

Describe the solution you'd like
Keep track of the quadratic control point somehow, for each q testing if the predicted control point matches with the actual control point, and replacing it with t if so.

Describe alternatives you've considered
Implement it myself? Not sure what to say

Additional context
For many circles, this would 66% the size (more realistically like 75% but still this is a big deal)