Restore shape atlas handling

src/app/layout/qgslayoutshapewidget.cpp

@@ -60,9 +60,11 @@ QgsLayoutShapeWidget::QgsLayoutShapeWidget( QgsLayoutItemShape *shape )
   connect( mShapeStyleButton, &QgsSymbolButton::changed, this, &QgsLayoutShapeWidget::symbolChanged );
   connect( mRadiusUnitsComboBox, &QgsLayoutUnitsComboBox::changed, this, &QgsLayoutShapeWidget::radiusUnitsChanged );
 
-#if 0 //TODO
-  mShapeStyleButton->setLayer( atlasCoverageLayer() );
-#endif
+  mShapeStyleButton->setLayer( coverageLayer() );
+  if ( mShape->layout() )
+  {
+    connect( &mShape->layout()->context(), &QgsLayoutContext::layerChanged, mShapeStyleButton, &QgsSymbolButton::setLayer );
+  }
 }
 
 bool QgsLayoutShapeWidget::setNewItem( QgsLayoutItem *item )

src/core/layout/qgslayoutitemshape.cpp

@@ -43,15 +43,6 @@ QgsLayoutItemShape::QgsLayoutItemShape( QgsLayout *layout )
     updateBoundingRect();
     update();
   } );
-
-#if 0 //TODO
-  if ( mComposition )
-  {
-    //connect to atlas feature changes
-    //to update symbol style (in case of data-defined symbology)
-    connect( &mComposition->atlasComposition(), &QgsAtlasComposition::featureChanged, this, &QgsComposerItem::repaint );
-  }
-#endif
 }
 
 int QgsLayoutItemShape::type() const