Friction: Forbidden duplicate window.

src/View/MainWindow.py

@@ -494,21 +494,38 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             lateral.activateWindow()
 
     def open_stricklers(self):
-        strick = StricklersWindow(
-            study = self.model,
-            config = self.conf,
-            parent = self
+        strick = self.sub_win_filter_first(
+            "Stricklers",
+            contain = []
         )
-        strick.show()
+
+        if strick is None:
+            strick = StricklersWindow(
+                study = self.model,
+                config = self.conf,
+                parent = self
+            )
+            strick.show()
+        else:
+            strick.activateWindow()
 
     def open_frictions(self):
         if (self.model is not None and
             self.model.river.has_current_reach()):
-            frictions = FrictionsWindow(
-                study = self.model,
-                parent = self
+
+            frictions = self.sub_win_filter_first(
+                "Frictions",
+                contain = [self.model.river.current_reach().name]
             )
-            frictions.show()
+
+            if frictions is None:
+                frictions = FrictionsWindow(
+                    study = self.model,
+                    parent = self
+                )
+                frictions.show()
+            else:
+                frictions.activateWindow()
         else:
             self.msg_select_reach()