src/vs/workbench/contrib/terminal/browser/widgets/widgetManager.ts/TerminalWidgetManager/attachToElement
class TerminalWidgetManager:	attachToElement(terminalWrapper: HTMLElement) {
		if (!this._container) {
			this._container = document.createElement('div');
			this._container.classList.add('terminal-widget-container');
			terminalWrapper.appendChild(this._container);
		}
	}