Switch "attachment" to "inline" on Content-Disposition

Issue: SPR-13587, SPR-13643

Author: rstoyanchev

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/AbstractMessageConverterMethodProcessor.java

@@ -254,7 +254,7 @@ private void addContentDispositionHeader(ServletServerHttpRequest request,
 		String extInPathParams = StringUtils.getFilenameExtension(pathParams);
 
 		if (!safeExtension(servletRequest, ext) || !safeExtension(servletRequest, extInPathParams)) {
-			headers.add("Content-Disposition", "attachment;filename=f.txt");
+			headers.add("Content-Disposition", "inline;filename=f.txt");
 		}
 	}