src/vs/base/browser/ui/grid/gridview.ts/LeafNode/linkedWidthNode
class LeafNode:	set linkedWidthNode(node: LeafNode | undefined) {
		this._onDidLinkedWidthNodeChange.input = node ? node._onDidViewChange : Event.None;
		this._linkedWidthNode = node;
		this._onDidSetLinkedNode.fire(undefined);
	}