src/vs/editor/common/services/editorSimpleWorker.ts/EditorSimpleWorker/computeUnicodeHighlights
class EditorSimpleWorker:	public async computeUnicodeHighlights(url: string, options: UnicodeHighlighterOptions, range?: IRange): Promise<IUnicodeHighlightsResult> {
		const model = this._getModel(url);
		if (!model) {
			return { ranges: [], hasMore: false, ambiguousCharacterCount: 0, invisibleCharacterCount: 0, nonBasicAsciiCharacterCount: 0 };
		}
		return UnicodeTextModelHighlighter.computeUnicodeHighlights(model, options, range);
	}