[PD] where to find $ args

[Rich E]

Ah, understood.  Thanks for the nice code explanation and references... they
both really help.

I noticed that t_canvasenvironment remains privately defined, so it's
difficult to use this struct.  To get the dollarzero, I saw this works:

   canvas_setcurrent(x_canvas);

int dzero = canvas_getdollarzero();

Cheers,
Rich
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