Input mouse event data now includes the 'isCombo' parameter which will be true if the mouse event is part of a combo.

app/js/ui/Input.js

           var ename = MouseEventName("mousemove");
           var data = {
             source: this,
+            isCombo: (ename.indexOf("+") >= 0),
             lastX: pos.lastX,
             lastY: pos.lastY,
             x: pos.x,
             var ename = MouseEventName();
             var data = {
               source: this,
+              isCombo: (ename.indexOf("+") >= 0),
               lastX: pos.lastX,
               lastY: pos.lastY,
               x: pos.x,
             this.__mouseLastAction = "mouseup";
             var data = {
               source: this,
+              isCombo: false,
               lastX: pos.lastX,
               lastY: pos.lastY,
               x: pos.x,
           var ename = MouseEventName("wheel");
           var data = {
             source: this,
+            isCombo: (ename.indexOf("+") >= 0),
             lastX: pos.lastX,
             lastY: pos.lastY,
             x: pos.x,