[issue45197] IDLE should suppress ValueError for list.remove()

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

The offending function is

        def event_delete(self, virtual, *sequences):
            if virtual not in self.__eventinfo:
                return
            func, triplets = self.__eventinfo[virtual]
            for seq in sequences:
                triplet = _parse_sequence(seq)
                if triplet is None:
                    #print("Tkinter event_delete: %s" % seq, file=sys.__stderr__)
                    widget.event_delete(self, virtual, seq)
                else:
                    if func is not None:
                        self.__binders[triplet[1]].unbind(triplet, func)
                    triplets.remove(triplet)

The triplets collection is part of *virtual* whereas each triplet is derived from a member of sequences. 
The discrepancy seems to be extremely rare.  I will catch the exception until such time as I see a plausible, reproducible, and testable reason.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45197>
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