FEM: allow to Suppress the constraints (#12359)

* FEM: Introduce suppressible constraints

* fix public inheritance

src/Mod/Fem/App/FemConstraint.cpp

@@ -109,6 +109,8 @@ Constraint::Constraint()
     Normals.setValues(std::vector<Base::Vector3d>());
 
     References.setScope(App::LinkScope::Global);
+
+    App::SuppressibleExtension::initExtension(this);
 }
 
 Constraint::~Constraint() = default;

src/Mod/Fem/App/FemConstraint.h

@@ -30,6 +30,7 @@
 #include <App/PropertyUnits.h>
 #include <Base/Vector3D.h>
 #include <Mod/Fem/FemGlobal.h>
+#include <App/SuppressibleExtension.h>
 
 
 namespace Fem
@@ -57,7 +58,7 @@ namespace Fem
  *  and @ref Scale and the protected method @ref getPoints(points&, normals&,
  *  scale&).
  */
-class FemExport Constraint: public App::DocumentObject
+class FemExport Constraint: public App::DocumentObject, public App::SuppressibleExtension
 {
     PROPERTY_HEADER_WITH_OVERRIDE(Fem::Constraint);
 

src/Mod/Fem/Gui/ViewProviderFemConstraint.cpp

@@ -84,6 +84,8 @@ ViewProviderFemConstraint::ViewProviderFemConstraint()
     wizardWidget = nullptr;
     wizardSubLayout = nullptr;
     constraintDialog = nullptr;
+
+    Gui::ViewProviderSuppressibleExtension::initExtension(this);
 }
 
 ViewProviderFemConstraint::~ViewProviderFemConstraint()

src/Mod/Fem/Gui/ViewProviderFemConstraint.h

@@ -31,6 +31,8 @@
 #include <Gui/ViewProviderPythonFeature.h>
 #include <Mod/Fem/FemGlobal.h>
 
+#include <Gui/ViewProviderSuppressibleExtension.h>
+
 
 class SoFontStyle;
 class SoText2;
@@ -44,7 +46,8 @@ namespace FemGui
 
 class TaskFemConstraint;
 
-class FemGuiExport ViewProviderFemConstraint: public Gui::ViewProviderGeometryObject
+class FemGuiExport ViewProviderFemConstraint: public Gui::ViewProviderGeometryObject,
+                                              public Gui::ViewProviderSuppressibleExtension
 {
     PROPERTY_HEADER_WITH_OVERRIDE(FemGui::ViewProviderFemConstraint);
 

src/Mod/Fem/femtools/membertools.py

@@ -59,7 +59,10 @@ def get_member(analysis, t):
     for m in analysis.Group:
         # since is _derived_from is used the father could be used
         # to test too (ex. "Fem::FemMeshObject")
-        if femutils.is_derived_from(m, t):
+        if (femutils.is_derived_from(m, t)
+            and not (m.hasExtension("App::SuppressibleExtension")
+                     and m.Suppressed)
+           ):
             matching.append(m)
     return matching