[Issue 13825] relativePath not handling "." and ".." correctly

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13825

--- Comment #1 from Thibaut CHARLES <cromfr at gmail.com> ---
my current workaround is to call buildNormalizedPath on each argument of
relativePath, but there is still an issue if the first path starts with "../"

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