When serializing text, encode all line breaks as CRLF pairs per the application/x-www-form-urlencoded specification. Fixes #6876.

src/ajax.js

@@ -107,9 +107,9 @@ jQuery.fn.extend({
 				null :
 				jQuery.isArray(val) ?
 					jQuery.map( val, function(val, i){
-						return {name: elem.name, value: val};
+						return {name: elem.name, value: val.replace(/\r?\n/g, "\r\n")};
 					}) :
-					{name: elem.name, value: val};
+					{name: elem.name, value: val.replace(/\r?\n/g, "\r\n")};
 		}).get();
 	}
 });