gh-130472: Remove readline-only hacks from PyREPL completions

[pablogsal]

PyREPL was still carrying over two readline-specific tricks from the
fancy completer: a synthetic CSI prefix to influence sorting and a fake
blank completion entry to suppress readline's prefix insertion. Those
workarounds are not appropriate in PyREPL because the reader already
owns completion ordering and menu rendering, so the fake entries leaked
into the UI as real terminal attributes and empty menu cells.

Sort completion candidates in ReadlineAlikeReader by their visible text
with stripcolor(), and let the fancy completer return only real matches.
That keeps colored completions stable without emitting bogus escape
sequences, removes the empty completion slot, and adds regression tests
for both the low-level completer output and the reader integration.

• Issue: Use colors in tab-completion in PyREPL #130472

[StanFromIreland]

It fixes my issues,

is it possible to have deeper alphabetic sorting, above all of the Py_ are jumbled together?

[hugovk]

Also good now:

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is it possible to have deeper alphabetic sorting, above all of the Py_ are jumbled together?

Looks like it's case-sensitive alphabetical, do you mean case-insensitive?

[StanFromIreland]

case-sensitive alphabetical

I mean case-sensitive alphabetical, but to not stop at the second character, _.

[pablogsal]

I mean case-sensitive alphabetical, but to not stop at the second character, _.

Let me see what I can do

[pablogsal]

Check the latest commit. If you mean something different you are going to need to explain in more detail what you have in mind :)

[StanFromIreland]

Oh sorry, you can revert the last commit, the current is better. I reviewed a7f83bd, LGTM