I can reproduce this on Linux. The editor isn’t messing with the wheel events, and the events themselves look fine … the browser just stops scrolling as soon as the editor draws new content to move the virtual viewport. This does indeed seem like a Chrome regression, and will probably also impact other software that does viewporting based on the scroll position. I don’t have time to look into this today, but I’ll try to make sure this is reported to the Chrome team and see if I can figure out a workaround until they fix it. It also affects CodeMirror 6, and they broke their own devtools with this, so it’s kind of surprising no one noticed before the release.