Commit dialog ignores "Select items automatically" when refreshing

What steps will reproduce the problem?

1. Turn off "Select items automatically" in the Commit section of Dialogs 2 item in the TortoiseGit Settings.
2. Open the commit dialog for a repository with a couple of files modified. Leave the files listed not selected.
3. Modify some additional files in the repository that were not previously modified.
4. Go back to the commit dialog and push F5.

What is the expected output? What do you see instead?

All the files listed after the last step should be unselected (i.e. unchecked). Instead, only the original files are unselected. The newly modified files are selected. They should not have been selected automatically.

What version of TortoiseGit and Git are you using? On what operating system?

2.5.0.0 on Windows 10 (1703).

Please provide any additional information below.

Somewhat related to fixed bug #212 (closed). However, this additional bug has been long-standing and has resulted in me inadvertently including changes in commits that I didn't want.