src/vs/editor/browser/viewParts/contentWidgets/contentWidgets.ts/ViewContentWidgets/addWidget
class ViewContentWidgets:	public addWidget(_widget: IContentWidget): void {
		const myWidget = new Widget(this._context, this._viewDomNode, _widget);
		this._widgets[myWidget.id] = myWidget;

		if (myWidget.allowEditorOverflow) {
			this.overflowingContentWidgetsDomNode.appendChild(myWidget.domNode);
		} else {
			this.domNode.appendChild(myWidget.domNode);
		}

		this.setShouldRender();
	}