Paul Davis 12b4807bc9 add a very (very) basic resize/layout design to the canvas ...

Items call ::queue_resize(), which sets a flag in the canvas; at next idle, we call
Canvas::layout() which walks the item tree and recursively calls layout (depth first)
on all items needing a resize.

Only Container types implement layout, and so far only Box

2021-08-13 12:51:26 -06:00

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