Paul Davis 860d43697c Canvas: propagate ::size_allocate() down the item tree ...

This previously wasn't done because of fear that it would affect the traditional fixed-sized canvas,
but only items that _layout_sensitive (i.e. are packed into a constraint packer directly) will
actually do anything in ::size_allocate().

Possibly might want to relax this to cover items that have a constraint packer between them
and a root group.

2021-08-13 12:51:27 -06:00

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