c_gtk_source_buffer_iter_forward_to_context_class_toggle

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GtkSourceBuffer* buffer, GtkTextIter* iter, const(char)* contextClass) c_gtk_source_buffer_iter_forward_to_context_class_toggle;

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