[FEM] constraint contact: sort out already available function

additionally add some comments in TaskFemConstraint.cpp

src/Mod/Fem/Gui/TaskFemConstraint.cpp

@@ -136,21 +136,23 @@ const std::string TaskFemConstraint::getScale() const //OvG: Return pre-calculat
 }
 
 void TaskFemConstraint::setSelection(QListWidgetItem* item) {
-    std::string s = item->text().toStdString();
+    // highlights the list item in the model
+
+    // get the document name
     std::string docName = ConstraintView->getObject()->getDocument()->getName();
-
+    // name of the item
+    std::string ItemName = item->text().toStdString();
+    // the object name is the part of the before the ':' of the item name
     std::string delimiter = ":";
-
     size_t pos = 0;
-    std::string objName;
-    std::string subName;
-    pos = s.find(delimiter);
-    objName = s.substr(0, pos);
-    s.erase(0, pos + delimiter.length());
-    subName = s;
-
+    pos = ItemName.find(delimiter);
+    std::string objName = ItemName.substr(0, pos);
+    // the subName is the name part tbehind the ':'
+    ItemName.erase(0, pos + delimiter.length());
+    // clear existing selection
     Gui::Selection().clearSelection();
-    Gui::Selection().addSelection(docName.c_str(), objName.c_str(), subName.c_str(), 0, 0, 0);
+    // highligh the selected item
+    Gui::Selection().addSelection(docName.c_str(), objName.c_str(), ItemName.c_str(), 0, 0, 0);
 }
 
 void TaskFemConstraint::onReferenceDeleted(const int row) {

src/Mod/Fem/Gui/TaskFemConstraintContact.cpp

@@ -384,24 +384,6 @@ void TaskFemConstraintContact::removeFromSelectionMaster()
     updateUI();
 }
 
-void TaskFemConstraintContact::setSelection(QListWidgetItem* item){
-    std::string docName=ConstraintView->getObject()->getDocument()->getName();
-
-    std::string s = item->text().toStdString();
-    std::string delimiter = ":";
-
-    size_t pos = 0;
-    std::string objName;
-    std::string subName;
-    pos = s.find(delimiter);
-    objName = s.substr(0, pos);
-    s.erase(0, pos + delimiter.length());
-    subName=s;
-
-    Gui::Selection().clearSelection();
-    Gui::Selection().addSelection(docName.c_str(),objName.c_str(),subName.c_str(),0,0,0);
-}
-
 void TaskFemConstraintContact::onReferenceDeletedSlave() {
     TaskFemConstraintContact::removeFromSelectionSlave();
 }

src/Mod/Fem/Gui/TaskFemConstraintContact.h

@@ -38,7 +38,6 @@
 #include <QObject>
 #include <Base/Console.h>
 #include <App/DocumentObject.h>
-#include <QListWidgetItem>
 
 class Ui_TaskFemConstraintContact;
 
@@ -61,7 +60,6 @@ private Q_SLOTS:
     void removeFromSelectionSlave();
     void addToSelectionMaster();
     void removeFromSelectionMaster();
-    void setSelection(QListWidgetItem* item);
 
 protected:
     void changeEvent(QEvent *e);