avoid opening of modal window on modifier+click

assets/javascripts/app/modal.js

@@ -1,5 +1,5 @@
 /*jslint indent: 2, regexp: false */
-/*globals $, Control, Element, Class, window, setTimeout */
+/*globals $, Control, Element, Class, Event, window, setTimeout */
 /*globals console */
 var Backlogs = (function () {
   var Modal, ModalLink, width;
@@ -21,6 +21,20 @@ var Backlogs = (function () {
       $super(container, Object.extend(Object.clone(Modal.defaultOptions), options || {}));
     },
 
+    open : function ($super, event) {
+      if (event) {
+        // catches middle clicks
+        if (!Event.isLeftClick(event)) {
+          return true;
+        }
+        // catches modifier keys
+        if (event.shiftKey || event.metaKey || event.ctrlKey || event.altKey) {
+          return true;
+        }
+      }
+      return $super(event);
+    },
+
     position : function ($super, event) {
       $super(event);
       this.fixPosition();

assets/javascripts/lib/livepipe-ui/window.js

@@ -192,9 +192,10 @@ Control.Window = Class.create({
                     }
                     //hover or click handling
                     this.sourceContainerOpenHandler = function(event){
-                        this.open(event);
-                        event.stop();
-                        return false;
+                        if (this.open(event) === false) {
+                          event.stop();
+                          return false;
+                        }
                     }.bindAsEventListener(this);
                     this.sourceContainerCloseHandler = function(event){
                         this.close(event);