Scale/pinching does not work perfectly

[doanngoctu95]

K-chart provided scale/pinching and drag horizontally but two operation do not work together perfectly.
It's a bit difficult to scale/pinching chart.
And when i debug in two operation above, i saw two operation overlapping each other.
And i had investigated about GestureDetector of Flutter i think it is a framework's problem.

Do you have any ideas or solution about this problem? @mafanwei

Tks so much!