src/vs/workbench/browser/parts/notifications/notificationsToasts.ts/NotificationsToasts/doHide
class NotificationsToasts:	private doHide(): void {
		if (this.notificationsToastsContainer) {
			this.notificationsToastsContainer.classList.remove('visible');
		}

		// Context Key
		this.notificationsToastsVisibleContextKey.set(false);

		// Events
		if (this._isVisible) {
			this._isVisible = false;
			this._onDidChangeVisibility.fire();
		}
	}