Terry J. Reedy added the comment:
[The light dawns, as the pieces connect together] The pseudoclass 'MyButton'
would then consist of all widgets with 'MyButton' inserted into its bindtags
list. Similarly for 'Editor'. I presume that a) tk has the equivalent of a
master bind dict mapping bindtags to dicts mapping event sequences strings to
event handlers, and b) .bind_class(cname, evseq, func) does the equivalent of
"tagdict.get(cname, {})[evseq] = func".
I also notice that the introspective versions of .bind... call will let us
discover the pre-defined bindings on difference systems and check our
alterations. Anyway, thanks. I will experiment when ready to refactor
bindings. In the meanwhile, I will apply the patch and close this.
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<http://bugs.python.org/issue27262>
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