src/vs/editor/common/services/modelService.ts/SemanticStyling/constructor
class SemanticStyling:	constructor(
		private readonly _themeService: IThemeService,
		private readonly _languageService: ILanguageService,
		private readonly _logService: ILogService
	) {
		super();
		this._caches = new WeakMap<DocumentTokensProvider, SemanticTokensProviderStyling>();
		this._register(this._themeService.onDidColorThemeChange(() => {
			this._caches = new WeakMap<DocumentTokensProvider, SemanticTokensProviderStyling>();
		}));
	}