Pamhyr: Implement window duplication deny mechanism with hash (#7).

src/View/Frictions/Window.py

@@ -83,6 +83,9 @@ class FrictionsWindow(PamhyrWindow):
             parent=parent
         )
 
+        # Add reach to hash computation data
+        self._hash_data.append(self._reach)
+
         self.setup_table()
         self.setup_graph()
         self.setup_connections()