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3b2799ce97
This commit does two things: adds a weak reference to the parent container of each SplitNode.Container and SplitNode.Leaf and moves the "direction" of a split out of the SplitNode enum and into the SplitNode.Container struct as a field. Both changes are required for supporting split resizing. A reference to the parent in each leaf and split container is needed in order to traverse upwards through the split tree. If the focused split is not part of a container that is split along the direction that was requested to be resized, then we instead try and resize the parent. If the parent is split along the requested direction, then it is resized appropriately; otherwise, repeat until the root of the tree is reached. The direction is needed inside the SplitNode.Container object itself so that the container knows whether or not it is able to resize itself in the direction requested by the user. Once the split direction was moved inside of SplitNode.Container, it became redundant to also have it as part of the SplitNode enum, so this simplifies things.