FEM: activate CommandMechanicalJobControl with_Solver selected

src/Mod/Fem/FemCommands.py

@@ -56,6 +56,8 @@ def IsActive(self):
                 active = FemGui.getActiveAnalysis() is not None and self.active_analysis_in_active_doc() and self.results_present()
             elif self.is_active == 'with_part_feature':
                 active = FreeCADGui.ActiveDocument is not None and self.part_feature_selected()
+            elif self.is_active == 'with_solver':
+                active = FemGui.getActiveAnalysis() is not None and self.active_analysis_in_active_doc() and self.solver_selected()
             return active
 
         def results_present(self):
@@ -75,3 +77,10 @@ def part_feature_selected(self):
 
         def active_analysis_in_active_doc(self):
             return FemGui.getActiveAnalysis().Document is FreeCAD.ActiveDocument
+
+        def solver_selected(self):
+            sel = FreeCADGui.Selection.getSelection()
+            if len(sel) == 1 and sel[0].isDerivedFrom("Fem::FemSolverObjectPython"):
+                return True
+            else:
+                return False

src/Mod/Fem/_CommandMechanicalJobControl.py

@@ -41,7 +41,7 @@ def __init__(self):
                           'MenuText': QtCore.QT_TRANSLATE_NOOP("Fem_JobControl", "Start calculation"),
                           'Accel': "S, C",
                           'ToolTip': QtCore.QT_TRANSLATE_NOOP("Fem_JobControl", "Dialog to start the calculation of the mechanical anlysis")}
-        self.is_active = 'with_analysis'
+        self.is_active = 'with_solver'
 
     def Activated(self):
         import _TaskPanelFemSolverCalculix