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Elias Naur
9b3429d6da
The layout package switched from interfaces to functions for composing layouts. The switch made sure that no garbage is generated for transient layouts such as Align, Inset, Stack, Flex. Unfortunately, that left the stateful widgets and layouts: as soon as their layout methods are embedded in a transient layout, a closure is generated that escapes to the heap. To avoid garbage for both transient as well as stateful widgets, replace the functional approach with explicit begin/end methods. A begin method generally starts an op block and returns the adjusted constraints. An end method takes computed dimensions, ends its op block and returns adjusted dimensions. Signed-off-by: Elias Naur <mail@eliasnaur.com>