pub unsafe extern "C" fn gtk_text_view_backward_display_line_start(
text_view: *mut GtkTextView,
iter: *mut GtkTextIter
) -> gboolean
pub unsafe extern "C" fn gtk_text_view_backward_display_line_start(
text_view: *mut GtkTextView,
iter: *mut GtkTextIter
) -> gboolean