src/vs/workbench/contrib/terminal/browser/terminalGroup.ts/SplitPaneContainer/constructor
class SplitPaneContainer:	constructor(
		private _container: HTMLElement,
		public orientation: Orientation,
		@IWorkbenchLayoutService private readonly _layoutService: IWorkbenchLayoutService
	) {
		super();
		this._width = this._container.offsetWidth;
		this._height = this._container.offsetHeight;
		this._createSplitView();
		this._splitView.layout(this.orientation === Orientation.HORIZONTAL ? this._width : this._height);
	}