gh-94436: cache failures in linecache

[picnixz]

I don't have a good Misc entry yet. I update the documentation when the implementation is accepted.

cc @iritkatriel

• Issue: linecache should remember files it failed to read and not try again #94436

[iritkatriel]

Thanks.

As you can see from the discussion on the issue, there are some doubts about whether we should do this at all.
It would probably need to be discussed on python-dev before we proceed.

[picnixz]

Sure! the idea was to suggest an implementation (actually, I took Victor's comment as the green light for that).

[picnixz]

Closing since we need to think of a better solution and since I'm cleaning up my local branches.