Animation with custom curve looks weird in v4

[FelixMittermeier]

Hi, first of all thank you very much for this great library. It is really the best flutter navigation bar I found so far.
After upgrading to version 4 today it looks like there is a regression with the animation when a custom curve is used, unfortunately. It is not so easy describe - maybe you just look at it yourself. I used the following values on GNav:

GNav(mainAxisAlignment: MainAxisAlignment.spaceAround,
     curve: Curves.easeOutExpo,
     duration: const Duration(milliseconds: 600),
)

This looks very smooth on version 3. After upgrading to version 4 the animation with the exact same values looks a bit harsh.
By removing the curve parameter completely from the widget it looks a lot better. So it is working fine when no custom curve is specified.

This has not high priority of course - just wanted to let you know :-)

[sooxt98]

@FelixMittermeier This is why i bump up the version, not just curve, padding also breaks as well 😉 In this version there's at least 6 diff curves, still no idea how to merge it into one