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sdati, thanks for this workaround. it's awesome. i am now
happily mouse-wheeling :)

I did make a small improvement to it so it works for all
MouseWheel type events. Instead of 
if sequence == "<MouseWheel>":
i say
if type(sequence) == str and
sequence.__contains__("MouseWheel"):

This way, all permutations of mouse events are covered, e.g.
 "<Control-MouseWheel>"