iter_backward_to_context_class_toggle

Moves backward 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 [class@Buffer] description for the list of default context classes.

Parameters:

this	a Buffer.
iter	a TextIter.
context_class	the context class.

Returns:

whether we found a context class toggle before iter