bug#50459: 28.0.50; Python shell completion is incompatible with flex, orderless, etc.

[Gregory Heytings]

> > It's not broken, it works as designed.  Instead of asking each user of 
> > the completion mechanism to implement a specific function for substring 
> > / flex completion, these mechanisms tell them "please return all 
> > possible completions, I'll do the filtering job for you".
>
> Right, this is not a problem with the flex style, it's a problem with 
> the Python completion table.  More specifically, with its notion of "all 
> completions".

Exactly.