Core: Call to resetInternals removed in remote validation callback (#2242)

* Core: Call to resetInternals removed in remote validation callback

* Core: Add unit test for issue #2150 fix

* Core: fix code style errors

Co-authored-by: leonardospina <leo@babieleo.it>
Co-authored-by: Julien Tschäppät <julien.tschappat@smartliberty.ch>

test/test.js

@@ -2060,6 +2060,37 @@ QUnit.test( "[Remote rule] #1508: Validation fails to trigger when next field is
 	check( "abc" );
 } );
 
+$.mockjax( {
+	url: "issue2150TestForm.action",
+	response: function() {
+		this.responseText = "true";
+	},
+	responseTime: 1
+} );
+
+QUnit.test( "Remote validation should not reset existing errors (#2150)", function( assert ) {
+	assert.expect( 3 );
+	var done = assert.async();
+	$( "#issue2150TestForm" ).validate( {
+		rules: {
+			remoteTestedInput: {
+				remote: "issue2150TestForm.action"
+			},
+			requiredInput: "required"
+		}
+	} );
+
+	assert.equal( $( "#requiredInput" ).attr( "class" ), undefined, "#requiredInput should not have any class" );
+
+	var isValid = $( "#issue2150TestForm" ).valid();
+
+	setTimeout( function() {
+		assert.equal( $( "#requiredInput" ).attr( "class" ), "error", "#requiredInput should have \"error\" class" );
+		assert.equal( isValid, false, "Form should have error" );
+		done();
+	} );
+} );
+
 QUnit.test( "validate checkbox on click", function( assert ) {
 	function errors( expected, message ) {
 		assert.equal( v.size(), expected, message );