See the attached project.

Right click on main.cpp in the Projects pane > Remove ... > Check "Delete file permanently" > Ok > "Remove the file ... (git) > Ok.

The file seems indeed to be removed from Git, but gives an error:

14:38:25 Running in /home/ah: /usr/bin/git rm --force main.cpp
fatal: Kein Git-Repository (oder irgendeines der Elternverzeichnisse): .git
The command "/usr/bin/git rm --force main.cpp" terminated with exit code 128.

So it looks like the working directory is not correctly set (should be /home/ah/TestRemoveFile) when running the `git rm` command.