Transition with search params.

backbone.js

@@ -1440,7 +1440,7 @@
       var path = decodeURI(this.location.pathname + this.getSearch());
       var root = this.root.slice(0, -1);
       if (!path.indexOf(root)) path = path.slice(root.length);
-      return path.slice(1);
+      return path.charAt(0) === '/' ? path.slice(1) : path;
     },
 
     // Get the cross-browser normalized URL fragment from the path or hash.

test/router.js

@@ -908,4 +908,20 @@
     Backbone.history.start();
   });
 
+  test('#3358 - pushState to hashChange transition with search params', 1, function() {
+    Backbone.history.stop();
+    location.replace('/root?foo=bar');
+    location.replace = function(url) {
+      strictEqual(url, '/root/#?foo=bar');
+    };
+    Backbone.history = _.extend(new Backbone.History, {
+      location: location,
+      history: {
+        pushState: undefined,
+        replaceState: undefined
+      }
+    });
+    Backbone.history.start({root: '/root', pushState: true});
+  });
+
 })();