Sirraide wrote:

> The downside to it being in `TextDiagnostic` is that consumers then all have 
> to normalize the path themselves (some file system APIs on some systems are 
> better about relative paths than others). If the paths are always equivalent, 
> it might be kinder to pass the resolved path. WDYT?

I mean, that’s also true I suppose; the only thing is then that we’d be 
normalising them twice if `-fdiagnostics-absolute-paths` is passed—unless we 
move the handling for that elsewhere as well, but now that’s dependent on the 
diagnostic options, so it probably shouldn’t be in `FileManager`—which leaves 
`DiagnosticsEngine`? But consumers don’t generally have access to the 
`DiagnosticsEngine`, so it’d have to be in the `FileManager` after all. 

I guess we could *always* compute both the absolute and the ‘short’ path for a 
file whenever `FileManager` opens one so that they’re always available. But 
that might have some impact on performance (though I guess this is a `perf/` 
branch already so we can try and see how it goes)?

@AaronBallman Thoughts?

https://github.com/llvm/llvm-project/pull/143520
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