src/vs/base/browser/ui/grid/gridview.ts/GridView/moveView
class GridView:	moveView(parentLocation: GridLocation, from: number, to: number): void {
		const [, parent] = this.getNode(parentLocation);

		if (!(parent instanceof BranchNode)) {
			throw new Error('Invalid location');
		}

		parent.moveChild(from, to);

		this.trySet2x2();
	}