Follow-up Comment #1, bug #18373 (project mypaint):
IMO it's a very bad idea to make an option for this. It should just work
right by default. Either I got it wrong the first time or the convention has
changed in Blender.
def dragfunc_zoom(self, dx, dy, x, y):
# workaround (should zoom at x=(first click point).x instead of
cursor)
self.tdw.scroll(-dx, -dy)
# The meaning of drag direction up/down is a convention from
# Blender and probably other 3D tools (Google Earth at least).
self.tdw.zoom(math.exp(-dy/100.0))
Anyways, I changed the direction now.
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