What should a user expect from git log -M -- file

Hi,

I recently reorganized a project of mine, and the result is that a lot of
files moved from the top directory to a sub directory.

Now, I innocently tried to 'git log -M' some of these files in the
subdirectories, and well, the history just stops when the file was
created. Obviously, if I put both the old and the new location it works,
but shouldn't users expect 'git log -M -- file' to try to find the
previous path and continue from there ?

Mike