pub unsafe extern "C" fn gtk_text_iter_get_visible_text(
start: *const GtkTextIter,
end: *const GtkTextIter,
) -> *mut c_char
pub unsafe extern "C" fn gtk_text_iter_get_visible_text(
start: *const GtkTextIter,
end: *const GtkTextIter,
) -> *mut c_char