Re: [PATCH 2/3] Implement --dirty for git-rebase--interactive.

Simon Sasburg [off-list ref] writes:

+restore_dirty_state () {
+	lastmsg=$(git-rev-list HEAD^..HEAD --pretty=oneline | sed "s:[^ ]* ::")
+	if test "$lastmsg" = "REBASE--dirty: store index..workingtree diff"
+	then
+		echo "Restoring dirty index state"
+		git reset --mixed HEAD^
+	fi
+	lastmsg=$(git-rev-list HEAD^..HEAD --pretty=oneline | sed "s:[^ ]* ::")
+	if test "$lastmsg" = "REBASE--dirty: store HEAD..index diff"
+	then
+		echo "Restoring dirty working dir state"
+		git reset --soft HEAD^
+	fi
+}

This forces the user to pay the two rev-list overhead, even when
running rebase without --dirty option.  Can we avoid paying any,
when not giving the option?

Also it pollutes the reflog of the branch, but that won't be a
huge issue with Dscho's "detach HEAD while rebasing" patch.