Alignment algorithm (was: Wrapping up the first two courses)

[John Rose]

On Apr 23, 2019, at 1:19 PM, Elias N Vasylenko <elias at vasylenko.uk> wrote:
> 
> But in any case I believe the justification for disabling auto-
> alignment when there is a non-empty first line stands for itself,
> regardless of how auto-alignment interacts with escapes.

FTR I like this approach also.  If there's something right after
the open-triquote, then there's no rectangle to extract.
Separately, we might choose to limit what can go right
after the open-triquote, on grounds of readability.
(See variations in my long message of earlier today.)