Don't remove space between a+ ++b

src/JS.php

@@ -335,8 +335,8 @@ class JS extends Minify
         $operators = array_combine($operators, $escaped);
 
         // make sure + and - can't be mistaken for ++ and --, which are special
-        $operators['+'] = '(?<!\+)\+(?!\+)';
+        $operators['+'] = '(?<!\+)\+(?!\s*\+)';
-        $operators['-'] = '(?<!\-)\-(?!\-)';
+        $operators['-'] = '(?<!\-)\-(?!\s*\-)';
 
         return $operators;
     }

tests/js/JSTest.php

@@ -249,6 +249,16 @@ else statement',
             'alert("this is a test")',
         );
 
+        // mix of ++ and +: three consecutive +es will be interpreted as ++ +
+        $tests[] = array(
+            'a++ +b',
+            'a+++b',
+        );
+        $tests[] = array(
+            'a+ ++b',
+            'a+ ++b',
+        );
+
         // add comment in between whitespace that needs to be stripped
         $tests[] = array(
             'object