Re: t3010 broken by 2eac2a4

> When 5102c617 (Add case insensitivity support for directories when
> using git status, 2010-10-03) added the directories to the name-hash
> with trailing slash, there was only a single name hash table to
> which both real cache entries and leading directory prefixes are
> registered, so it made some sense to register them with trailing
> slashes so that we can tell what kind of entry is being returned.
> 
> But since 2092678c (name-hash.c: fix endless loop with
> core.ignorecase=true, 2013-02-28), these directory entries that are
> not the cache entries are kept track of in a separate hashtable,
> which makes me wonder if it still makes sense to register
> directories with trailing slashes.
> 
> And if we stop doing that (and instead if we shrunk the namelen when
> an unconverted caller asks for a name with a trailing slash to see
> if a directory exists in the index), wouldn't it automatically fix
> the directory_exists_in_index_icase()?  It does not need to assume
> that dirname[len] has '/'; after all, it may not even be a valid
> memory location in the first place.