Fix the "Change Label" map tool after labeling refactoring

The support for rule-based labeling is not there yet (only simple labeling)

This code has been funded by Tuscany Region (Italy) - SITA (CIG: 63526840AE) and commissioned to Gis3W s.a.s.

Author: wonder-sk

src/app/qgisapp.cpp

@@ -9401,7 +9401,7 @@ void QgisApp::activateDeactivateLayerRelatedActions( QgsMapLayer* layer )
   {
     QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( it.value() );
     if ( !vlayer || !vlayer->isEditable() ||
-         ( !vlayer->diagramsEnabled() && vlayer->customProperty( "labeling" ).toString() != QString( "pal" ) ) )
+         ( !vlayer->diagramsEnabled() && !vlayer->labelsEnabled() ) )
       continue;
 
     int colX, colY, colShow, colAng;

src/core/qgsmaprenderercustompainterjob.cpp

@@ -168,7 +168,12 @@ bool QgsMapRendererCustomPainterJob::isActive() const
 
 QgsLabelingResults* QgsMapRendererCustomPainterJob::takeLabelingResults()
 {
-  return mLabelingEngine ? mLabelingEngine->takeResults() : 0;
+  if ( mLabelingEngine )
+    return mLabelingEngine->takeResults();
+  else if ( mLabelingEngineV2 )
+    return mLabelingEngineV2->takeResults();
+  else
+    return 0;
 }
 
 

src/core/qgsmaprendererparalleljob.cpp

@@ -163,7 +163,12 @@ bool QgsMapRendererParallelJob::isActive() const
 
 QgsLabelingResults* QgsMapRendererParallelJob::takeLabelingResults()
 {
-  return mLabelingEngine ? mLabelingEngine->takeResults() : 0;
+  if ( mLabelingEngine )
+    return mLabelingEngine->takeResults();
+  else if ( mLabelingEngineV2 )
+    return mLabelingEngineV2->takeResults();
+  else
+    return 0;
 }
 
 QImage QgsMapRendererParallelJob::renderedImage()

src/core/qgsvectorlayer.cpp

@@ -668,7 +668,16 @@ QgsRectangle QgsVectorLayer::boundingBoxOfSelected()
 
 bool QgsVectorLayer::labelsEnabled() const
 {
-  return customProperty( "labeling/enabled", QVariant( false ) ).toBool();
+  if ( !mLabeling )
+    return false;
+
+  // for simple labeling the mode can be "no labels" - so we need to check
+  // in properties whether we are really enabled or not
+  if ( mLabeling->type() == "simple" )
+    return customProperty( "labeling/enabled", QVariant( false ) ).toBool();
+
+  // for other labeling implementations we always assume that labeling is enabled
+  return true;
 }
 
 bool QgsVectorLayer::diagramsEnabled() const