src/vs/workbench/contrib/terminal/browser/terminalInstance.ts/TerminalInstance/_updateUnicodeVersion
class TerminalInstance:	private async _updateUnicodeVersion(): Promise<void> {
		if (!this._xterm) {
			throw new Error('Cannot update unicode version before xterm has been initialized');
		}
		if (!this._xtermUnicode11 && this._configHelper.config.unicodeVersion === '11') {
			const Addon = await this._terminalInstanceService.getXtermUnicode11Constructor();
			this._xtermUnicode11 = new Addon();
			this._xterm.loadAddon(this._xtermUnicode11);
		}
		this._xterm.unicode.activeVersion = this._configHelper.config.unicodeVersion;
	}