Addressing issue #1572. The new mtext parameter introduced by #1081 should be applied to a draw_text method of a backend, not to a PathEffect (yet?).
@dopplershift Does this fix the error you are seeing? Seems to work for me now.
fix issue #1572 caused by PR #1081
Fixes it here for me as well.
If your both happy with this, then please go ahead and merge (FWIW you have my 👍).