Fix #12350: jQuery.trim should remove BOM

src/core.js

@@ -37,8 +37,8 @@ var
 	core_rnotwhite = /\S/,
 	core_rspace = /\s+/,
 
-	// IE doesn't match non-breaking spaces with \s
-	rtrim = core_rnotwhite.test("\xA0") ? (/^[\s\xA0]+|[\s\xA0]+$/g) : /^\s+|\s+$/g,
+	// Make sure we trim BOM and NBSP (here's looking at you, Safari 5.0 and IE)
+	rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,
 
 	// A simple way to check for HTML strings
 	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
@@ -605,7 +605,7 @@ jQuery.extend({
 	},
 
 	// Use native String.trim function wherever possible
-	trim: core_trim ?
+	trim: core_trim && !core_trim.call("\uFEFF\xA0") ?
 		function( text ) {
 			return text == null ?
 				"" :

test/unit/core.js

@@ -264,7 +264,7 @@ test("noConflict", function() {
 });
 
 test("trim", function() {
-	expect(9);
+	expect(13);
 
 	var nbsp = String.fromCharCode(160);
 
@@ -278,6 +278,11 @@ test("trim", function() {
 	equal( jQuery.trim( null ), "", "Null" );
 	equal( jQuery.trim( 5 ), "5", "Number" );
 	equal( jQuery.trim( false ), "false", "Boolean" );
+
+	equal( jQuery.trim(" "), "", "space should be trimmed" );
+	equal( jQuery.trim("ipad\xA0"), "ipad", "nbsp should be trimmed" );
+	equal( jQuery.trim("\uFEFF"), "", "zwsp should be trimmed" );
+	equal( jQuery.trim("\uFEFF \xA0! | \uFEFF"), "! |", "leading/trailing should be trimmed" );
 });
 
 test("type", function() {