displayName in DnDTreeItem

a displayName defined on creation. Usually on fields the fieldname and on relations the relationname.
no other logical use for that. The DnDTreeItem.name is used as id and should be unique, not like displayName.

src/app/qgsattributesformproperties.cpp

@@ -88,14 +88,14 @@ void QgsAttributesFormProperties::initAvailableWidgetsTree()
 
   //load Fields
 
-  DnDTreeItemData catItemData = DnDTreeItemData( DnDTreeItemData::Container, "Fields" );
+  DnDTreeItemData catItemData = DnDTreeItemData( DnDTreeItemData::Container, "Fields", "Fields" );
   QTreeWidgetItem *catitem = mAvailableWidgetsTree->addItem( mAvailableWidgetsTree->invisibleRootItem(), catItemData );
 
   const QgsFields fields = mLayer->fields();
   for ( int i = 0; i < fields.size(); ++i )
   {
     const QgsField field = fields.at( i );
-    DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Field, field.name() );
+    DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Field, field.name(), field.name() );
     itemData.setShowLabel( true );
 
     FieldConfig cfg( mLayer, i );
@@ -108,14 +108,14 @@ void QgsAttributesFormProperties::initAvailableWidgetsTree()
   catitem->setExpanded( true );
 
   //load Relations
-  catItemData = DnDTreeItemData( DnDTreeItemData::Container, "Relations" );
+  catItemData = DnDTreeItemData( DnDTreeItemData::Container, "Relations", "Relations" );
   catitem = mAvailableWidgetsTree->addItem( mAvailableWidgetsTree->invisibleRootItem(), catItemData );
 
   const QList<QgsRelation> relations = QgsProject::instance()->relationManager()->referencedRelations( mLayer );
 
   for ( const QgsRelation &relation : relations )
   {
-    DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Relation, QStringLiteral( "%1" ).arg( relation.id() ) );
+    DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Relation, QStringLiteral( "%1" ).arg( relation.id() ), QStringLiteral( "%1" ).arg( relation.name() ) );
     itemData.setShowLabel( true );
 
     RelationConfig cfg( mLayer, relation.id() );
@@ -399,7 +399,7 @@ QTreeWidgetItem *QgsAttributesFormProperties::loadAttributeEditorTreeItem( QgsAt
   {
     case QgsAttributeEditorElement::AeTypeField:
     {
-      DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Field, widgetDef->name() );
+      DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Field, widgetDef->name(), widgetDef->name() );
       itemData.setShowLabel( widgetDef->showLabel() );
       newWidget = tree->addItem( parent, itemData );
       break;
@@ -408,7 +408,7 @@ QTreeWidgetItem *QgsAttributesFormProperties::loadAttributeEditorTreeItem( QgsAt
     case QgsAttributeEditorElement::AeTypeRelation:
     {
       const QgsAttributeEditorRelation *relationEditor = static_cast<const QgsAttributeEditorRelation *>( widgetDef );
-      DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Relation, relationEditor->relation().id());
+      DnDTreeItemData itemData = DnDTreeItemData( DnDTreeItemData::Relation, relationEditor->relation().id(), relationEditor->relation().name());
       itemData.setShowLabel( widgetDef->showLabel() );
       RelationEditorConfiguration relEdConfig;
       relEdConfig.showLinkButton = relationEditor->showLinkButton();
@@ -420,7 +420,7 @@ QTreeWidgetItem *QgsAttributesFormProperties::loadAttributeEditorTreeItem( QgsAt
 
     case QgsAttributeEditorElement::AeTypeContainer:
     {
-      DnDTreeItemData itemData( DnDTreeItemData::Container, widgetDef->name() );
+      DnDTreeItemData itemData( DnDTreeItemData::Container, widgetDef->name(), widgetDef->name() );
       itemData.setShowLabel( widgetDef->showLabel() );
 
       const QgsAttributeEditorContainer *container = static_cast<const QgsAttributeEditorContainer *>( widgetDef );
@@ -771,7 +771,7 @@ QTreeWidgetItem *DnDTree::addContainer( QTreeWidgetItem *parent, const QString &
   QTreeWidgetItem *newItem = new QTreeWidgetItem( QStringList() << title );
   newItem->setBackground( 0, QBrush( Qt::lightGray ) );
   newItem->setFlags( Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled );
-  QgsAttributesFormProperties::DnDTreeItemData itemData( QgsAttributesFormProperties::DnDTreeItemData::Container, title );
+  QgsAttributesFormProperties::DnDTreeItemData itemData( QgsAttributesFormProperties::DnDTreeItemData::Container, title, title );
   itemData.setColumnCount( columnCount );
   newItem->setData( 0, QgsAttributesFormProperties::DnDTreeRole, itemData );
   parent->addChild( newItem );
@@ -811,6 +811,7 @@ QTreeWidgetItem *DnDTree::addItem( QTreeWidgetItem *parent, QgsAttributesFormPro
     }
   }
   newItem->setData( 0, QgsAttributesFormProperties::DnDTreeRole, data );
+  newItem->setText( 0, data.displayName() );
 
   if ( index < 0 )
     parent->addChild( newItem );
@@ -1082,19 +1083,21 @@ void DnDTree::setType( const Type &value )
 
 QDataStream &operator<<( QDataStream &stream, const QgsAttributesFormProperties::DnDTreeItemData &data )
 {
-  stream << ( quint32 )data.type() << data.name();
+  stream << ( quint32 )data.type() << data.name() << data.displayName();
   return stream;
 }
 
 QDataStream &operator>>( QDataStream &stream, QgsAttributesFormProperties::DnDTreeItemData &data )
 {
   QString name;
+  QString displayName;
   quint32 type;
 
-  stream >> type >> name;
+  stream >> type >> name >> displayName;
 
   data.setType( ( QgsAttributesFormProperties::DnDTreeItemData::Type )type );
   data.setName( name );
+  data.setDisplayName( displayName );
 
   return stream;
 }

src/app/qgsattributesformproperties.h

@@ -83,9 +83,10 @@ class APP_EXPORT QgsAttributesFormProperties : public QWidget, private Ui_QgsAtt
         //do we need that
         DnDTreeItemData() = default;
 
-        DnDTreeItemData( Type type, const QString &name )
+        DnDTreeItemData( Type type, const QString &name, const QString &displayName )
           : mType( type )
           , mName( name )
+          , mDisplayName( displayName )
           , mColumnCount( 1 )
           , mShowAsGroupBox( false )
           , mShowLabel( true )
@@ -94,6 +95,9 @@ class APP_EXPORT QgsAttributesFormProperties : public QWidget, private Ui_QgsAtt
         QString name() const { return mName; }
         void setName( const QString &name ) { mName = name; }
 
+        QString displayName() const { return mDisplayName; }
+        void setDisplayName( const QString &displayName ) { mDisplayName = displayName; }
+
         Type type() const { return mType; }
         void setType( Type type ) { mType = type; }
 
@@ -117,6 +121,7 @@ class APP_EXPORT QgsAttributesFormProperties : public QWidget, private Ui_QgsAtt
       private:
         Type mType = Field;
         QString mName;
+        QString mDisplayName;
         int mColumnCount = 1;
         bool mShowAsGroupBox = false;
         bool mShowLabel = true;