Moves forward to the next toggle (on or off) of the context class. If no
matching context class toggles are found, returns FALSE, otherwise TRUE.
Does not return toggles located at iter, only toggles after iter. Sets
iter to the location of the toggle, or to the end of the buffer if no
toggle is found.
See the gsv.SourceBuffer description for the list of default context classes.
Moves forward to the next toggle (on or off) of the context class. If no matching context class toggles are found, returns FALSE, otherwise TRUE. Does not return toggles located at iter, only toggles after iter. Sets iter to the location of the toggle, or to the end of the buffer if no toggle is found.
See the gsv.SourceBuffer description for the list of default context classes.