symlinks aren't resolved correctly

[cfal]

apologies for the vague title. this happens with neovim on ubuntu 20.04 when opening files from the command line, or from inside vim (:e). i ran into this issue when using rust.vim which doesn't autosave formatted code correctly when the file path is still a symlink.

example:

mkdir test
echo "hello" > test/hello.txt
mkdir test2 && cd test2
ln -s ../test
vim test/hello.txt

:files will show:

  1 %a   "test/hello.txt"              line 1

.. which is still a symlink.

the problem seems to be:

autocmd BufRead * nested call s:on_buf_read(expand('<afile>'))

once i changed it to:

autocmd BufRead * nested call s:on_buf_read(expand('%'))

it expands correctly:

  2 %a   "../test/hello.txt"            line 1