Re: issue unable to commit file and folder name to upper lower case

> Thank you for filling out a Git bug report!
> Please answer the following questions to help us understand your issue.
>
> What did you do before the bug happened? (Steps to reproduce your issue)
> $ mkdir abc
>
> $ echo "">abc/.keep
>
> $ git status
> On branch master
> Untracked files:
>   (use "git add <file>..." to include in what will be committed)
>         abc/
>
> $ mv abc Abc
>
> $ git status
> On branch master
> Untracked files:
>   (use "git add <file>..." to include in what will be committed)
>         Abc/                                                      # rename
> to Abc/ successfully
>
> $ git commit -m "commit Abc/"                                     # commit
>
> $ mv Abc abc
>
> $ git status
> On branch master
> nothing to commit, working tree clean                             # cannot
> rename again
>
> $ git diff
> >""
>
> $ git add .
>
> $ git commit -m "Cannot rename from Abc/ to abc/"
> On branch master
> nothing to commit, working tree clean                             # cannot
> commit to right, keep old file name / folder name
>
>
> What did you expect to happen? (Expected behavior)
> It should be correct to new name although just change upper/lower case,
> because other commiter can pull it from repo or improve reading clarity.
>
> What happened instead? (Actual behavior)
> can commit file/folder but cannot fix upper/lower case.
>
> What's different between what you expected and what actually happened?
> git unable to faithfully represent file/folder upper/lower case changes.
>