Tortoise treats file names as case sensitive on Windows

What steps will reproduce the problem?

1. create git repo
2. create file a.txt then add and commit it to the repo
3. rename a.txt to A.txt

What is the expected output?

What do you see instead?

Additional information

git status says:

nothing to commit, working directory clean

What version of TortoiseGit and Git are you using?

TortoiseGit 2.4.0.2 (64-bit)

git version 2.8.2.windows.1 (64-bit)

On what operating system?

Windows 7 Pro 64-bit