Trying to draw objects on fabric.js ctx ( to prevent selection / z-index, and make something like rulers at the top of canvas) but after mouse:wheel i see strange stack effect with my drawn object. But on 'selection' event, ctx clears and works fine. Can't understand why mouse:wheel and after:render and other events in fabric.js works so strange and how i can fix this. Thanks!
Found solution, just add clearContext method inside before:render in my case