adding composer.json

src/vs/workbench/services/textfile/common/textFileEditorModel.ts

@@ -42,7 +42,7 @@ export class TextFileEditorModel extends BaseTextEditorModel implements ITextFil
 
 	static DEFAULT_CONTENT_CHANGE_BUFFER_DELAY = CONTENT_CHANGE_EVENT_BUFFER_DELAY;
 	static DEFAULT_ORPHANED_CHANGE_BUFFER_DELAY = 100;
-	static WHITELIST_JSON = ['package.json', 'package-lock.json', 'tsconfig.json', 'jsconfig.json', 'bower.json', '.eslintrc.json', 'tslint.json'];
+	static WHITELIST_JSON = ['package.json', 'package-lock.json', 'tsconfig.json', 'jsconfig.json', 'bower.json', '.eslintrc.json', 'tslint.json', 'composer.json'];
 
 	private static saveErrorHandler: ISaveErrorHandler;
 	static setSaveErrorHandler(handler: ISaveErrorHandler): void { TextFileEditorModel.saveErrorHandler = handler; }