Re: [PATCH v3 10/9] difftool: do not allow mix of '--prompt' with '--no-prompt'

Tim Henigan [off-list ref] writes:

When difftool was changed to use Getopt::Long, it changed the way that
the '--prompt' and '--no-prompt' options are handled. Prior to the change,
if both options were given, then the last option was used.  After the
change, if both were given, then '--prompt' was always used.

This commit teaches difftool to exit with an error if both options are
given at the command line. t7800 was updated to match.

Hrm, people with "[alias] mdt = difftool --prompt" have every right to
expect their

	$ git mdt --no-prompt

to keep working, no?