Revert "FEM: Updated fix to constraint displacement reference deletion, update hide show, remove custom input writer, update vertice, edge, face selection."

This reverts commit ac4d466443.

src/Mod/Fem/Gui/TaskFemConstraint.cpp

@@ -181,11 +181,6 @@ const QString TaskFemConstraint::makeRefText(const App::DocumentObject* obj, con
 
 //==== calls from the TaskView ===============================================================
 
-void TaskDlgFemConstraint::open()
-{
-    ConstraintView->setVisible(true);
-    Gui::Command::doCommand(Gui::Command::Doc,ViewProviderFemConstraint::gethideMeshShowPartStr((static_cast<Fem::Constraint*>(ConstraintView->getObject()))->getNameInDocument()).c_str()); //OvG: Hide meshes and show parts
-}
 
 bool TaskDlgFemConstraint::accept()
 {