src/vs/editor/contrib/unicodeHighlighter/browser/bannerController.ts/BannerController/show
class BannerController:	public show(item: IBannerItem) {
		this.banner.show({
			...item,
			onClose: () => {
				this.hide();
				if (item.onClose) {
					item.onClose();
				}
			}
		});
		this._editor.setBanner(this.banner.element, BANNER_ELEMENT_HEIGHT);
	}