boolean function ( ) { return historyStrategy . hasChangedSubject ( ) ; }
returns true if there is a message within the history of the room that has changed the room 's subject . concode_field_sep HistoryStrategy historyStrategy concode_elem_sep boolean isNonAnonymousRoom concode_elem_sep MUCRoom room concode_field_sep void addOldMessage concode_elem_sep ListIterator<Message> getReverseMessageHistory concode_elem_sep void addMessage concode_elem_sep Iterator<Message> getMessageHistory concode_elem_sep Message getChangedSubject