Re: emacs-27 e1e0a7a 2/2: xref--collect-matches: Speed up on remote

[Stefan Monnier]

>> It does go through Tramp for the initial `expand-file-name`, but AFAIK
>> this shouldn't need to talk to the remote host (unless it has a ~/ or
>> ~<user>/ in the remote part of the name, I guess?).
> That's how it is implemented, yes. However, remote file names with a
> relative localname part, are also expanded via prepending "~/" to the
> localname. For performance reasons it is better to avoid such file names.

In the context of `xref--collect-matches`, I'd expect the file name passed
to `get-file-buffer` to be either fully expanded file names or relative
file names (with a fully expanded `default-directory`), so in that case
`expand-file-name` should presumably "always" return without contacting
the remote host, right?


        Stefan