src/vs/workbench/services/untitled/common/untitledTextEditorModel.ts/UntitledTextEditorModel/getLanguageId
class UntitledTextEditorModel:	override getLanguageId(): string | undefined {
		if (this.textEditorModel) {
			return this.textEditorModel.getLanguageId();
		}

		return this.preferredLanguageId;
	}