This message is sent when the status of a buffer changes. It may not be vetoed by a subscriber, so that all subscribers are assured of receiving it regardless of an individual subscriber's response.
public Buffer getBuffer();
public View getView();
This may be null with some message types.
public Object getWhat();
Returns one of the following constants defined in the BufferUpdate class:
CREATED
LOAD_STARTED
DIRTY_CHANGED
MARKERS_CHANGED
MODE_CHANGED
ENCODING_CHANGED
SAVING