src/vs/workbench/browser/parts/editor/editorPart.ts/EditorPart/isTwoDimensionalGrid
class EditorPart:	private isTwoDimensionalGrid(): boolean {
		const views = this.gridWidget.getViews();
		if (isGridBranchNode(views)) {
			// the grid is 2-dimensional if any children
			// of the grid is a branch node
			return views.children.some(child => isGridBranchNode(child));
		}

		return false;
	}