Mesh: activate button in toolbar only when a study is selected

src/View/MainWindow.py

@@ -158,6 +158,7 @@ other_model_action = [
 define_model_action = [
     # Toolbar
     "action_toolBar_network", "action_toolBar_geometry",
+    "action_toolBar_meshing",
     "action_toolBar_boundary_cond", "action_toolBar_lateral_contrib",
     "action_toolBar_frictions", "action_toolBar_initial_cond",
     # Menu

src/View/ui/MainWindow.ui

@@ -884,6 +884,9 @@
    </property>
   </action>
   <action name="action_toolBar_meshing">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
    <property name="checkable">
     <bool>true</bool>
    </property>