Thank you Richard.
I see what the issue for me was. Groups do indeed receive a
resizeControl message automatically if the rect is changed by script.
However, the message (resizeControl) use seems inconsistent. For
example, while a group does received the resizeControl message, a field
does not seem to. Also, what I specifically ran into was that the PDF
Widget does not received a resizeControl handler (and it would be really
useful if it did!)
I'll submit an enhancement request (below) for adding resizeControl to
the PDF Widget (assuming it's possible), but I don't have the time to
determine what widgets support resizeControl and which don't and what LC
objects (other than groups) support resizeControl and which don't.
https://quality.livecode.com/show_bug.cgi?id=24437
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