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0(blah,blah) looks like mouse wheel events are coming. It looks like gesture events are not properly generated, so it's probably best to make FreeCAD ignore them altogether on MacOS.
For zooming I use two fingers on the touchpad. Move them up is zooming out, moving down is zooming in. All this happens on the 0(blah,blah) events. Please don't disable them too , the rest can well be ignored, as far as I am concerned.
So I looked at the code, and it's probably the double start event that is causing a problem. I have for some reason commented out the ignoring of extra start events (don't remember why I did, possibly as an attempt to fix some early bug), now I wonder if I can uncomment it and it fixes the problem... I'll experiment later, i'm overloaded right now.