rustdoc: Use relative paths in source renders. #19436
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Before:
doc/src/collections/home/lifthrasiir/git/rust/src/libcollections/vec.rs.html
After:
doc/src/collections/vec.rs.html
If the source code is in the parent dirs relative to the crate root,
..
is replaced withup
as expected. Any other error like non-UTF-8 paths or drive-relative paths falls back to the absolute path.There might be a way to improve on false negatives, but this alone should be enough for fixing #18370.