Record whether a callout corresponds to a feature which has all parts labeled in the callout context

This is useful information for dictating how a callout should be rendered

python/core/auto_generated/callouts/qgscallout.sip.in

@@ -160,7 +160,7 @@ The default order is QgsCallout.OrderBelowIndividualLabels.
 
     struct QgsCalloutContext
     {
-      bool temporary;
+      bool allFeaturePartsLabeled;
     };
 
     void render( QgsRenderContext &context, QRectF rect, const double angle, const QgsGeometry &anchor, QgsCalloutContext &calloutContext );

src/core/callouts/qgscallout.h

@@ -183,9 +183,8 @@ class CORE_EXPORT QgsCallout
      */
     struct CORE_EXPORT QgsCalloutContext
     {
-      ///@cond PRIVATE
+      //! TRUE if all parts of associated feature were labeled
-      bool temporary = false; // Temporary member only, required for building on some platforms
+      bool allFeaturePartsLabeled = false;
-      ///@endcond
     };
 
     /**

src/core/qgsvectorlayerlabelprovider.cpp

@@ -305,6 +305,7 @@ void QgsVectorLayerLabelProvider::drawCallout( QgsRenderContext &context, pal::L
     QgsGeometry g( QgsGeos::fromGeos( label->getFeaturePart()->feature()->geometry() ) );
     g.transform( xform.transform() );
     QgsCallout::QgsCalloutContext calloutContext;
+    calloutContext.allFeaturePartsLabeled = label->getFeaturePart()->feature()->labelAllParts();
     mSettings.callout()->render( context, rect, label->getAlpha() * 180 / M_PI, g, calloutContext );
   }
 }