Issue on zoom out with mouse Wheel

[Alvarrito]

Hello, I have found an issue when zoom out with the mouse Wheel. When I do zoom In it is ok (from 100% to 225%) but when zoom out is not ok (from 100% to -25%, negative percentage).

Thanks

[phuocng]

Thank for reporting the issue, @Alvarrito 👍

[MeKo-Christian]

In zoom.js it would help changing the line

var scaleDiff = 1 - e.deltaY / 100;

to

var scaleDiff = Math.pow(0.9, e.deltaY * -0.01);

or something similar. With this, the zoom factor cannot get negative anymore.