src/vs/platform/terminal/node/ptyService.ts/PtyService/updateIcon
class PtyService:	async updateIcon(id: number, userInitiated: boolean, icon: URI | { light: URI; dark: URI } | { id: string; color?: { id: string } }, color?: string): Promise<void> {
		this._throwIfNoPty(id).setIcon(userInitiated, icon, color);
	}