InitialConditions: Forbidden duplicate window.

src/View/MainWindow.py

@@ -531,11 +531,19 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
 
     def open_initial_conditions(self):
         if self.model.river.has_current_reach():
+            initial = self.sub_win_filter_first(
+                "Initial condition",
+                contain = [self.model.river.current_reach().name]
+            )
+
+            if initial is None:
                 initial = InitialConditionsWindow(
                     study = self.model,
                     parent = self
                 )
                 initial.show()
+            else:
+                initial.activateWindow()
         else:
             self.msg_select_reach()