bug#43984: `--with-graft=...` doesn't work with packages of different length name/version

[pkill9]

> > Maybe if the length/version is different, then a symlink could be
> > created in the store pointing to the new dependency, with a
> > name/version that matches the length of the original dependency's
> > store name? Perhaps this new name/version could be something like
> > /gnu/store/...-original-dependency-name-gggggg, where 'g..' matches
> > the length of the version of the original dependency. The many 'g's
> > would make it clear that it is a graft. Then if someone looks in
> > the store, they would see it's a symlink too.  
> 
> That only works if the new name is shorter than the old name though.
> When the new name is longer (which is a more common case in our
> experience when introducing package replacements, typically because
> the new version string is longer), nothing can be done.

I'm confused about what you mean. Why would it matter if the new
name is longer than the old name?