Fixes #8125. Status is set to 200 for requests with status 0 when...

Fixes #8125. Status is set to 200 for requests with status 0 when location.protocol if "file:". Added test/localfile.html to control it works.

src/ajax/xhr.js

@@ -156,12 +156,14 @@ if ( jQuery.support.ajax ) {
 									statusText = "";
 								}
 
-								// Filter status for non standard behaviours
+								// Filter status for non standard behaviors
 								status =
+									// Most browsers return 0 when it should be 200 for local files
 									// Opera returns 0 when it should be 304
 									// Webkit returns 0 for failing cross-domain no matter the real status
-									status === 0 ?
-										(
+									!status ?
+										// All: for local files, 0 is a success
+										( location.protocol === "file:" ? 200 : (
 											// Webkit, Firefox: filter out faulty cross-domain requests
 											!s.crossDomain || statusText ?
 											(
@@ -172,7 +174,7 @@ if ( jQuery.support.ajax ) {
 											) :
 											// We assume 302 but could be anything cross-domain related
 											302
-										) :
+										) ) :
 										(
 											// IE sometimes returns 1223 when it should be 204 (see #1450)
 											status == 1223 ?

test/localfile.html

+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr" id="html">
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+	<title>jQuery Local File Test</title>
+	<!-- Includes -->
+	<script src="../src/core.js"></script>
+	<script src="../src/support.js"></script>
+	<script src="../src/data.js"></script>
+	<script src="../src/queue.js"></script>
+	<script src="../src/attributes.js"></script>
+	<script src="../src/event.js"></script>
+	<script src="../src/sizzle/sizzle.js"></script>
+	<script src="../src/sizzle-jquery.js"></script>
+	<script src="../src/traversing.js"></script>
+	<script src="../src/manipulation.js"></script>
+	<script src="../src/css.js"></script>
+	<script src="../src/ajax.js"></script>
+	<script src="../src/ajax/jsonp.js"></script>
+	<script src="../src/ajax/script.js"></script>
+	<script src="../src/ajax/xhr.js"></script>
+	<script src="../src/effects.js"></script>
+	<script src="../src/offset.js"></script>
+	<script src="../src/dimensions.js"></script>
+</head>
+
+<body>
+	<script>
+	jQuery.ajax( "data/badjson.js" , {
+		dataType: "text"
+	}).success(function() {
+		$( "<div/>" ).text( "Success OK" ).appendTo( "body" );
+	});
+	jQuery.ajax( "data/doesnotexist.ext" , {
+		dataType: "text"
+	}).error(function() {
+		$( "<div/>" ).text( "Error OK" ).appendTo( "body" );
+	});
+	</script>
+</body>
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