bug#45135: 28.0.50; [PATCH] Add option to print file names in *xref* buffer relative to project root

[Dmitry Gutov]

On 23.12.2020 04:16, Dmitry Gutov wrote:
> Re: patch 2, I have an idea that would make it a bit simpler and less 
> coupled to project.el, but behave the same in the usual cases. Stay tuned.

Not as clean as I hoped, but here's something that should work just as 
well, and a lot faster to boot (project-current lookup for every file 
name is slow when there are a lot of matches, even if each individual 
project-current call looks fast).

We could remove the explicit dependency on the "current project" if it 
was always passed in from the outside (e.g. by project-find-regexp's 
setup), but we probably want this display mode to work with 
xref-find-references as well.

Also simplified the docstring a bit.

Tobias, please try the attached patch.

xref-file-name-display-relative.diff
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