Replace missing reach warning with a reach selection dropdown list on opening geometry, frictions, sediment layers, and initial conditions

src/View/MainWindow.py

@@ -918,13 +918,31 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
     # MSG AND DIALOG #
     ##################
 
-    def msg_select_reach(self):
-        self.message_box(
-            window_title=self._trad["Warning"],
-            text=self._trad["mb_select_reach_title"],
-            informative_text=self._trad["mb_select_reach_msg"]
+    def ensure_current_reach(self):
+        """Offer a reach selection when needed; return False on cancellation."""
+        if self._study is None:
+            return False
+        river = self._study.river
+        if river.has_current_reach():
+            return True
+        edges = list(river.edges())
+        if not edges:
+            QMessageBox.information(
+                self, self._trad["Select reach"], self._trad["no_reach"]
             )
-        self.open_network()
+            return False
+        labels = [f"{edge.name or self._trad['reach']} (#{edge.id})"
+                  for edge in edges]
+        selected, accepted = QInputDialog.getItem(
+            self, self._trad["Select reach"],
+            self._trad["reach"] + ":", labels, 0, False
+        )
+        if not accepted:
+            return False
+        river.set_current_reach(edges[labels.index(selected)])
+        self._tab_widget_graph.update()
+        self._propagate_update(key=Modules.NETWORK)
+        return True
 
     def dialog_reopen_study(self):
         dlg = QMessageBox(self)
@@ -1359,7 +1377,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         Returns:
             Nothing
         """
-        if (self._study is not None and self._study.river.has_current_reach()):
+        if self.ensure_current_reach():
             reach = self._study.river.current_reach().reach
 
             if self.sub_window_exists(
@@ -1379,8 +1397,6 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             )
             geometry.show()
             return geometry
-        else:
-            self.msg_select_reach()
         return None
 
     def open_meshing(self):
@@ -1464,8 +1480,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         strick.show()
 
     def open_frictions(self):
-        if self._study is not None:
-            if self._study.river.has_current_reach():
+        if self.ensure_current_reach():
             reach = self._study.river.current_reach()
 
             if self.sub_window_exists(
@@ -1480,11 +1495,9 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                 parent=self
             )
             frictions.show()
-            else:
-                self.msg_select_reach()
 
     def open_initial_conditions(self):
-        if self._study.river.has_current_reach():
+        if self.ensure_current_reach():
             reach = self._study.river.current_reach()
 
             if self.sub_window_exists(
@@ -1500,8 +1513,6 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
                 parent=self
             )
             initial.show()
-        else:
-            self.msg_select_reach()
 
     def open_additional_files(self):
         if self._study is not None:
@@ -1575,8 +1586,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
             )
             return
 
-        if not self._study.river.has_current_reach():
-            self.msg_select_reach()
+        if not self.ensure_current_reach():
             return
 
         reach = self._study.river.current_reach().reach

src/View/Translate.py

@@ -209,13 +209,8 @@ class MainTranslate(UnitTranslate):
         self._dict["Warning"] = _translate(
             "MainWindow", "Warning"
         )
-        self._dict["mb_select_reach_title"] = _translate(
-            "MainWindow", "Please select a reach"
-        )
-        self._dict["mb_select_reach_msg"] = _translate(
-            "MainWindow",
-            "This edition window need a reach selected "
-            "into the river network to work on it"
+        self._dict["no_reach"] = _translate(
+            "MainWindow", "Create a reach in the network before opening this window."
         )
 
         self._dict["mb_last_open_title"] = _translate(