src/vs/workbench/browser/parts/banner/bannerPart.ts/BannerPart/setVisibility
class BannerPart:	private setVisibility(visible: boolean): void {
		if (visible !== this.visible) {
			this.visible = visible;
			this.focusedActionIndex = -1;

			this.layoutService.setBannerHidden(!visible);
			this._onDidChangeSize.fire(undefined);
		}
	}