Auxiliary fields are linked to data defined for all subproviders

python/core/qgsauxiliarystorage.sip

@@ -183,14 +183,13 @@ class QgsAuxiliaryLayer : QgsVectorLayer
  :rtype: QgsPropertyDefinition
 %End
 
-    static int createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *vlayer, const QString &providerId = QString() );
+    static int createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *vlayer );
 %Docstring
  Creates if necessary a new auxiliary field for a PAL property and
  activate this property in settings.
 
  \param property The property to create
  \param vlayer The vector layer
- \param providerId The id of the provider to use
 
  :return: The index of the auxiliary field or -1
  :rtype: int

src/app/qgsmaptoollabel.cpp

@@ -744,7 +744,7 @@ bool QgsMapToolLabel::createAuxiliaryFields( LabelDetails &details, QgsPalIndexe
     }
     else
     {
-      index = QgsAuxiliaryLayer::createProperty( p, vlayer, providerId );
+      index = QgsAuxiliaryLayer::createProperty( p, vlayer );
     }
 
     indexes[p] = index;

src/core/qgsauxiliarystorage.cpp

@@ -215,26 +215,32 @@ bool QgsAuxiliaryLayer::save()
   return rc;
 }
 
-int QgsAuxiliaryLayer::createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *layer, const QString &providerId )
+int QgsAuxiliaryLayer::createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *layer )
 {
   int index = -1;
 
   if ( layer && layer->labeling() && layer->auxiliaryLayer() )
   {
-    const QgsPropertyDefinition def = layer->labeling()->settings( providerId ).propertyDefinitions()[property];
+    // property definition are identical whatever the provider id
+    const QgsPropertyDefinition def = layer->labeling()->settings().propertyDefinitions()[property];
     const QString fieldName = nameFromProperty( def, true );
 
-    if ( layer->auxiliaryLayer()->addAuxiliaryField( def ) )
+    layer->auxiliaryLayer()->addAuxiliaryField( def );
+
+    if ( layer->auxiliaryLayer()->indexOfPropertyDefinition( def ) >= 0 )
     {
       const QgsProperty prop = QgsProperty::fromField( fieldName );
 
-      QgsPalLayerSettings *settings = new QgsPalLayerSettings( layer->labeling()->settings( providerId ) );
+      for ( const QString &providerId : layer->labeling()->subProviders() )
+      {
+        QgsPalLayerSettings *settings = new QgsPalLayerSettings( layer->labeling()->settings( providerId ) );
 
-      QgsPropertyCollection c = settings->dataDefinedProperties();
-      c.setProperty( property, prop );
-      settings->setDataDefinedProperties( c );
+        QgsPropertyCollection c = settings->dataDefinedProperties();
+        c.setProperty( property, prop );
+        settings->setDataDefinedProperties( c );
 
-      layer->labeling()->setSettings( settings, providerId );
+        layer->labeling()->setSettings( settings, providerId );
+      }
     }
 
     index = layer->fields().lookupField( fieldName );

src/core/qgsauxiliarystorage.h

@@ -200,11 +200,10 @@ class CORE_EXPORT QgsAuxiliaryLayer : public QgsVectorLayer
      *
      * \param property The property to create
      * \param vlayer The vector layer
-     * \param providerId The id of the provider to use
      *
      * \returns The index of the auxiliary field or -1
      */
-    static int createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *vlayer, const QString &providerId = QString() );
+    static int createProperty( QgsPalLayerSettings::Property property, QgsVectorLayer *vlayer );
 
     /**
      * Creates if necessary a new auxiliary field for a diagram's property and