Change in 28.1 in opening a file from grep results on Windows

[Pascal Quesseveur]

Emacs 28.1 on Windows.

c:\Users\Public\app is a symbolic link to either a remote directory on
a SMB server or a local disk

I can open file c:\Users\Public\app\file1.c, and launch a command from
that file, eg an ant build

I execute grep from c:\Users\Public\app\file1.c. When I open a file in
results buffer (eg file2.c), the file is opened with its true name,
\\smbserver\app\file2.c, and then I can not execute same command as
before on file1.c because cmd.exe is not allowed from a remote
directory.

To verify file existence in compilation-find-file, emacs calls
file-truename instead of expand-file-name (version 27.1). In my case
the later is better, but I am not aware of all the possible cases.


-- 
Pascal Quesseveur
pquessev@gmail.com