Orderless never returns a sole match for `switch-to-buffer`

[mm--]

Orderless never returns a sole match for `switch-to-buffer`

[minad]

This should be fixed by comparing the candidate to one and only throw orderless--many if they are actually different. Furthermore we should probably return t from our "predicate" to avoid interfering with completion tables which rely on the filtered list of candidates (like the or in this case). This will still be efficient since for more than one candidate we will still throw orderless--many.

(There is the chance that some tables are broken by our filtering method, namely the ones which call the predicate before filtering the candidates against the patterns. But that's inefficient and tables shouldn't do this.)

[oantolin]

Thanks for reporting this! I agree with @minad's suggestion to fix this and will get on it when I get the chance, probably this weekend.