git-gui: warn when trying to commit on a detached head

The commandline is already warning when checking out a detached head.
Since the only thing thats potentially dangerous is to create commits
on a detached head lets warn in case the user is about to do that.

Signed-off-by: Heiko Voigt <hvoigt@hvoigt.net>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
2 files changed