Reduce SessionItem signaling

• reduce SessionItem signaling regarding sample items
• cleanup/simplify code
• fix warning

GUI/Model/Job/ParameterTreeUtils.cpp

@@ -19,6 +19,7 @@
 #include "GUI/Model/Instrument/InstrumentItems.h"
 #include "GUI/Model/Job/JobItem.h"
 #include "GUI/Model/Material/MaterialItem.h"
+#include "GUI/Model/Sample/FTDistributionItems.h"
 #include "GUI/Model/Sample/InterferenceItems.h"
 #include "GUI/Model/Sample/Lattice2DItems.h"
 #include "GUI/Model/Sample/LayerItem.h"
@@ -148,8 +149,26 @@ void GUI::Model::ParameterTreeUtils::createParameterTree(JobItem* jobItem,
         layer->setRoughnessEnabled(!isFirstLayer);
         layer->setThicknessEnabled(!isFirstLayer && !isLastLayer);
 
-        for (auto* layout : layer->layouts())
+        for (auto* layout : layer->layouts()) {
             layout->enableDensity(!layout->totalDensityIsDefinedByInterference());
+
+            // if PDF1 and PDF2 are of same type, add a number to the name
+            if (auto* itf = dynamic_cast<Interference2DParaCrystalItem*>(
+                    layout->interference().currentItem())) {
+                SessionItem* pdf1 = itf->probabilityDistribution1().currentItem();
+                SessionItem* pdf2 = itf->probabilityDistribution2().currentItem();
+
+                if (pdf1 && pdf2) {
+                    if (pdf1->modelType() == pdf2->modelType()) {
+                        pdf1->setDisplayName(pdf1->modelType() + " 0");
+                        pdf2->setDisplayName(pdf2->modelType() + " 1");
+                    } else {
+                        pdf1->setDisplayName(pdf1->modelType());
+                        pdf2->setDisplayName(pdf2->modelType());
+                    }
+                }
+            }
+        }
     }
 
     populateParameterContainer(container, jobItem->sampleItem(), recreateBackupValues);