git-gui: Don't prepend the prefix if value looks like a full path

When argument parsing fails to detect a file name, "git-gui" will try to
use the previously detected "head" as the file name. We should avoid
prepending the prefix if "head" looks like a full path.

Signed-off-by: Andrew Wong <andrew.kw.w@gmail.com>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
1 file changed