Relative file paths in assists / diagnostics

[Superpat]

It would be a bit more readable if file paths in the diagnostics window where relative to the workspace. I think this should be possible, either by doing some magic in the Win or setting the base path of the L win to the workspace.

[rsc]

Agreed. v0.12.0 does this for the output of things like Ldef and Lrefs, but a few more cases remain to be fixed.

[kmx1]

Maybe another point for consideration:
previously Lrefs used absolute paths, which is less readable but works always when you click it (buttom3 / jump / plumb it).
now relative paths work great when using Lrefs as cmd inside acme (middle click).
Lrefs writes to stdout, acme opens window as "(pwd)+Errors" window.

but when using Lrefs from outside acme, the new behaviour of using relative paths breaks clicking/jumping to the file:line.
I am using 2 keyboard shortcuts (via xbindkeys) for Ldef and Lrefs.
for Lrefs i use a wrapper script to display the results in acme again, like this:
Lrefs | plumb -i -d edit -a 'action=showdata filename=/LSP/References'
now those paths are relative to where i started the xbindkeys cmd (cause of os.Getwd() in PrintLocations)

while testing this i saw that the underlying issue is probably more acme-related.
windows with tag/names like "/LSP/Xyz" dont correctly jump/plumb to relative file paths. (even though when executing "pwd" inside of "/LSP/Diagnostics" it points to the correct directory, but trying to jump/click ./cmd/L/main.go does not work)

so i guess one would need to manually handle the button3 click inside the diagnostics window to make it work :-/
(or mess with plumbing rules vs. pwd? ; or is there way to set the wd of an acme window explicitly?)

i tried hardcoding acme-lsp/internal/lsp/acmelsp/diagnostics.go:96 to the base dir of the repo (where i started acme and acme-lsp, same as when executing pwd inside "/LSP/Diagnostics" window) but the button3/right click on diagnostics messages does not jump/plumb correctly when relative paths are displayed.

I added a new flag for Lrefs (-show) to show the results in a dedicated acme window, and implemented a workaround for PrintLocations to use an empty basedir (so it prints absolute paths).
https://github.com/kmx1/acme-lsp (i also removed deprecated uses of ioutil)