[FEM] sort equations alphabetically

- to ease readability a bit

src/Mod/Fem/CMakeLists.txt

@@ -250,9 +250,9 @@ SET(FemSolverElmer_SRCS
 
 SET(FemSolverElmerEquations_SRCS
     femsolver/elmer/equations/__init__.py
+    femsolver/elmer/equations/elasticity.py
     femsolver/elmer/equations/electricforce.py
     femsolver/elmer/equations/electrostatic.py
-    femsolver/elmer/equations/elasticity.py
     femsolver/elmer/equations/equation.py
     femsolver/elmer/equations/flow.py
     femsolver/elmer/equations/flux.py

src/Mod/Fem/femcommands/commands.py

@@ -397,23 +397,6 @@ class _ElementRotation1D(CommandManager):
         self.do_activated = "add_obj_on_gui_noset_edit"
 
 
-class _EquationElectrostatic(CommandManager):
-    "The FEM_EquationElectrostatic command definition"
-
-    def __init__(self):
-        super(_EquationElectrostatic, self).__init__()
-        self.menutext = Qt.QT_TRANSLATE_NOOP(
-            "FEM_EquationElectrostatic",
-            "Electrostatic equation"
-        )
-        self.tooltip = Qt.QT_TRANSLATE_NOOP(
-            "FEM_EquationElectrostatic",
-            "Creates a FEM equation for electrostatic"
-        )
-        self.is_active = "with_solver_elmer"
-        self.do_activated = "add_obj_on_gui_selobj_noset_edit"
-
-
 class _EquationElasticity(CommandManager):
     "The FEM_EquationElasticity command definition"
 
@@ -431,6 +414,40 @@ class _EquationElasticity(CommandManager):
         self.do_activated = "add_obj_on_gui_selobj_noset_edit"
 
 
+class _EquationElectricforce(CommandManager):
+    "The FEM_EquationElectricforce command definition"
+
+    def __init__(self):
+        super(_EquationElectricforce, self).__init__()
+        self.menutext = Qt.QT_TRANSLATE_NOOP(
+            "FEM_EquationElectricforce",
+            "Electricforce equation"
+        )
+        self.tooltip = Qt.QT_TRANSLATE_NOOP(
+            "FEM_EquationElectricforce",
+            "Creates a FEM equation for electric forces"
+        )
+        self.is_active = "with_solver_elmer"
+        self.do_activated = "add_obj_on_gui_selobj_noset_edit"
+
+
+class _EquationElectrostatic(CommandManager):
+    "The FEM_EquationElectrostatic command definition"
+
+    def __init__(self):
+        super(_EquationElectrostatic, self).__init__()
+        self.menutext = Qt.QT_TRANSLATE_NOOP(
+            "FEM_EquationElectrostatic",
+            "Electrostatic equation"
+        )
+        self.tooltip = Qt.QT_TRANSLATE_NOOP(
+            "FEM_EquationElectrostatic",
+            "Creates a FEM equation for electrostatic"
+        )
+        self.is_active = "with_solver_elmer"
+        self.do_activated = "add_obj_on_gui_selobj_noset_edit"
+
+
 class _EquationFlow(CommandManager):
     "The FEM_EquationFlow command definition"
 
@@ -465,23 +482,6 @@ class _EquationFlux(CommandManager):
         self.do_activated = "add_obj_on_gui_selobj_noset_edit"
 
 
-class _EquationElectricforce(CommandManager):
-    "The FEM_EquationElectricforce command definition"
-
-    def __init__(self):
-        super(_EquationElectricforce, self).__init__()
-        self.menutext = Qt.QT_TRANSLATE_NOOP(
-            "FEM_EquationElectricforce",
-            "Electricforce equation"
-        )
-        self.tooltip = Qt.QT_TRANSLATE_NOOP(
-            "FEM_EquationElectricforce",
-            "Creates a FEM equation for electric forces"
-        )
-        self.is_active = "with_solver_elmer"
-        self.do_activated = "add_obj_on_gui_selobj_noset_edit"
-
-
 class _EquationHeat(CommandManager):
     "The FEM_EquationHeat command definition"
 
@@ -1156,14 +1156,18 @@ FreeCADGui.addCommand(
     "FEM_ElementRotation1D",
     _ElementRotation1D()
 )
-FreeCADGui.addCommand(
-    "FEM_EquationElectrostatic",
-    _EquationElectrostatic()
-)
 FreeCADGui.addCommand(
     "FEM_EquationElasticity",
     _EquationElasticity()
 )
+FreeCADGui.addCommand(
+    "FEM_EquationElectricforce",
+    _EquationElectricforce()
+)
+FreeCADGui.addCommand(
+    "FEM_EquationElectrostatic",
+    _EquationElectrostatic()
+)
 FreeCADGui.addCommand(
     "FEM_EquationFlow",
     _EquationFlow()
@@ -1172,10 +1176,6 @@ FreeCADGui.addCommand(
     "FEM_EquationFlux",
     _EquationFlux()
 )
-FreeCADGui.addCommand(
-    "FEM_EquationElectricforce",
-    _EquationElectricforce()
-)
 FreeCADGui.addCommand(
     "FEM_EquationHeat",
     _EquationHeat()

src/Mod/Fem/femsolver/equationbase.py

@@ -89,26 +89,6 @@ class ElasticityViewProxy(BaseViewProxy):
         return ":/icons/FEM_EquationElasticity.svg"
 
 
-class ElectrostaticViewProxy(BaseViewProxy):
-
-    def getIcon(self):
-        return ":/icons/FEM_EquationElectrostatic.svg"
-
-
-class ElectrostaticProxy(BaseProxy):
-    pass
-
-
-class FluxViewProxy(BaseViewProxy):
-
-    def getIcon(self):
-        return ":/icons/FEM_EquationFlux.svg"
-
-
-class FluxProxy(BaseProxy):
-    pass
-
-
 class ElectricforceViewProxy(BaseViewProxy):
 
     def getIcon(self):
@@ -119,6 +99,16 @@ class ElectricforceProxy(BaseProxy):
     pass
 
 
+class ElectrostaticViewProxy(BaseViewProxy):
+
+    def getIcon(self):
+        return ":/icons/FEM_EquationElectrostatic.svg"
+
+
+class ElectrostaticProxy(BaseProxy):
+    pass
+
+
 class FlowProxy(BaseProxy):
     pass
 
@@ -128,4 +118,15 @@ class FlowViewProxy(BaseViewProxy):
     def getIcon(self):
         return ":/icons/FEM_EquationFlow.svg"
 
+
+class FluxViewProxy(BaseViewProxy):
+
+    def getIcon(self):
+        return ":/icons/FEM_EquationFlux.svg"
+
+
+class FluxProxy(BaseProxy):
+    pass
+
+
 ##  @}