The normal behaviour now is to create a temp file to
save the new data, then rename (move) original filename
to same name + .bak, then rename (move) temp file to
original filename. This process has the undesired
effect of change the names if editing a symbolic link file.
It would be nice to have the option (in preferences) to
change this process to first copy original filename to
same name + .bak and then overwrite the original
filename with the new data saved. This way it would
work also editing symbolic links to files.