src/vs/workbench/api/browser/mainThreadComments.ts/MainThreadComments/registerViewOpenedListener
class MainThreadComments:	private registerViewOpenedListener() {
		if (!this._openViewListener) {
			this._openViewListener = this._viewsService.onDidChangeViewVisibility(e => {
				if (e.id === COMMENTS_VIEW_ID && e.visible) {
					this.setComments();
					if (this._openViewListener) {
						this._openViewListener.dispose();
						this._openViewListener = null;
					}
				}
			});
		}
	}