(begin|commit)_reversible_command in Editor and Session git-svn-id: svn://localhost/ardour2/branches/undo@684 d708f5d6-7413-0410-9779-e7cbd77b26cf
(begin|commit)_reversible_command in Editor and Session git-svn-id: svn://localhost/ardour2/branches/undo@684 d708f5d6-7413-0410-9779-e7cbd77b26cf