📝Reification of drawing operations allows implementing Flutter layout model in a single pass
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Gio reifies drawing as a list of operations (Ops). These Ops can be captured, replayed, transformed, etc.
Effectively, this allows implementing the Flutter layout model in a single pass:
widget appends its operations to the ops and returns its Size (Dimensions) to the caller
the caller (parent) can then retroactively apply transform to position the children