Update default eol on language change if model has no eol yet

src/vs/editor/common/services/modelServiceImpl.ts

@@ -218,6 +218,10 @@ export class ModelServiceImpl extends Disposable implements IModelService {
 	}
 
 	private static _setModelOptionsForModel(model: ITextModel, newOptions: ITextModelCreationOptions, currentOptions: ITextModelCreationOptions): void {
+		if (currentOptions && currentOptions.defaultEOL !== newOptions.defaultEOL && model.getLineCount() === 1) {
+			model.setEOL(newOptions.defaultEOL === DefaultEndOfLine.LF ? EndOfLineSequence.LF : EndOfLineSequence.CRLF);
+		}
+
 		if (currentOptions
 			&& (currentOptions.detectIndentation === newOptions.detectIndentation)
 			&& (currentOptions.insertSpaces === newOptions.insertSpaces)