clone last input event to preserve multiple directions

src/inputs.d

@@ -15,6 +15,12 @@ class InputEvent
     uint tick;
     Inputs inputs;
     InputEvent next;
+
+    this() { }
+    this(InputEvent ie)
+    {
+        inputs = ie.inputs;
+    }
 };
 
 class InputEventList
@@ -35,7 +41,7 @@ public:
         }
         else if (m_last_event.tick < tick)
         {
-            m_last_event.next = new InputEvent();
+            m_last_event.next = new InputEvent(m_last_event);
             m_last_event = m_last_event.next;
             m_last_event.tick = tick;
         }