If you have a file a.h and a file a.c in a directory ./a and then create symlinks to the files in a directory ./b, then open ./a/a.h and ./b/a.c, FSwitch fails to switch between the two files with E94: No matching buffer. The solution is to use bufnr() instead of the filename for the buffer command which ensures you get the buffer number that was checked in bufexists().
If you have a file
a.hand a filea.cin a directory./aand then create symlinks to the files in a directory./b, then open./a/a.hand./b/a.c, FSwitch fails to switch between the two files withE94: No matching buffer. The solution is to usebufnr()instead of the filename for the buffer command which ensures you get the buffer number that was checked inbufexists().