[issue12568] Add functions to get the width in columns of a character

[poq]

poq <poq at gmx.com> added the comment:

Martin,

I agree that wcswidth is incorrect with respect to Unicode. However I don't think that's relevant at all. Python should only try to match the behaviour of the terminal.

Since terminals do slightly different things, trying to match them exactly - in all cases, on all systems - is virtually impossible. But AFAICT wcwidth should match the terminal behaviour on nearly all modern systems, so it makes sense to expose it.

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