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f064e72b9b
If the filename passed to vim_FullName() is a relative directory, and
does not exist, it is appended to the current working directory. Since
the return value of append_path() was ignored, and if the buffer length
was too small to fit getcwd() + dirname(filename), it would still try to
append the basename(filename).
This was manifesting as a failure in test/unit/path_spec.lua in:
itp('fails and uses filename if given filename contains non-existing directory', ..
This failure occurs when running the tests from directory with a short
path such as: /work/src/nv
test/unit/path_spec.lua:420: Expected objects to be the same.
Passed in:
(string) '/work/src/nv/test.file'
Expected:
(string) 'non_existing_dir/test.file'
This return value for the second call to append_path() to append
basename(filename) was checked, and this is where it would fail for
normal / longer getcwd()s.