[issue31485] Tkinter widget.unbind(sequence, funcid) unbind all bindings

[Giovanni Lombardo]

Giovanni Lombardo <g.lombardo at protonmail.com> added the comment:

I propose the below fix:

```
    def unbind(self, sequence, funcid=None):
        """Unbind for this widget for event SEQUENCE  the
        function identified with FUNCID."""
        bound = ''
        if funcid:
            self.deletecommand(funcid)
            funcs = self.tk.call('bind', self._w, sequence, None).split('\n')
            bound = '\n'.join([f for f in funcs if not f.startswith('if {{"[{0}'.format(funcid))])
        self.tk.call('bind', self._w, sequence, bound)
```

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31485>
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