fix crash when removing layers with highlighed features

python/gui/qgshighlight.sip

@@ -7,17 +7,27 @@ class QgsHighlight : QgsMapCanvasItem
     QgsHighlight( QgsMapCanvas *mapCanvas, QgsGeometry *geom, QgsVectorLayer *layer );
     ~QgsHighlight();
 
+    /** Set line/outline to color, polygon fill to color with alpha = 63.
+     *  This is legacy function, use setFillColor() after setColor() if different fill color is required. */
     void setColor( const QColor & color );
 
+    /** Set polygons fill color.
+     * @note: added in version 2.3 */
     void setFillColor( const QColor & fillColor );
 
     /** Set width. Ignored in feature mode. */
     void setWidth( int width );
 
+    /** Set line / outline buffer in millimeters.
+     *  @note: added in version 2.3 */
     void setBuffer( double buffer );
 
+    /** Set minimum line / outline width in millimeters.
+     *  @note: added in version 2.3 */
     void setMinWidth( double width );
 
+    const QgsMapLayer *layer() const;
+
   protected:
     virtual void paint( QPainter* p );
 

src/gui/qgshighlight.cpp

@@ -13,8 +13,6 @@
  *                                                                         *
  ***************************************************************************/
 
-#include <typeinfo>
-
 #include <QImage>
 
 #include "qgsmarkersymbollayerv2.h"
@@ -134,7 +132,7 @@ void QgsHighlight::setFillColor( const QColor & fillColor )
 QgsFeatureRendererV2 * QgsHighlight::getRenderer( const QgsRenderContext & context, const QColor & color, const QColor & fillColor )
 {
   QgsFeatureRendererV2 *renderer = 0;
-  QgsVectorLayer *layer = vectorLayer();
+  QgsVectorLayer *layer = qobject_cast<QgsVectorLayer*>( mLayer );
   if ( layer && layer->rendererV2() )
   {
     renderer = layer->rendererV2()->clone();
@@ -345,7 +343,9 @@ void QgsHighlight::paint( QPainter* p )
   }
   else if ( mFeature.geometry() )
   {
-    QgsVectorLayer *layer = vectorLayer();
+    QgsVectorLayer *layer = qobject_cast<QgsVectorLayer*>( mLayer );
+    if( !layer )
+      return;
     QgsMapSettings mapSettings = mMapCanvas->mapSettings();
     QgsRenderContext context = QgsRenderContext::fromMapSettings( mapSettings );
 
@@ -438,9 +438,3 @@ void QgsHighlight::updateRect()
     setRect( QgsRectangle() );
   }
 }
-
-QgsVectorLayer * QgsHighlight::vectorLayer()
-{
-  return dynamic_cast<QgsVectorLayer *>( mLayer );
-}
-

src/gui/qgshighlight.h

@@ -66,6 +66,8 @@ class GUI_EXPORT QgsHighlight: public QgsMapCanvasItem
      *  @note: added in version 2.3 */
     void setMinWidth( double width ) { mMinWidth = width; }
 
+    const QgsMapLayer *layer() const { return mLayer; }
+
   protected:
     virtual void paint( QPainter* p );
 
@@ -82,10 +84,6 @@ class GUI_EXPORT QgsHighlight: public QgsMapCanvasItem
     void paintLine( QPainter *p, QgsPolyline line );
     void paintPolygon( QPainter *p, QgsPolygon polygon );
 
-    QgsVectorLayer *vectorLayer();
-
-    QgsHighlight();
-
     QBrush mBrush;
     QPen mPen;
     QgsGeometry *mGeometry;

src/gui/qgsmaptoolidentify.cpp

@@ -650,10 +650,11 @@ void QgsMapToolIdentify::handleMenuHover()
         QList<IdentifyResult>::const_iterator idListIt = idList.constBegin();
         for ( ; idListIt != idList.constEnd(); ++idListIt )
         {
-          QgsHighlight* hl = new QgsHighlight( mCanvas, idListIt->mFeature.geometry(), vl );
+          QgsHighlight *hl = new QgsHighlight( mCanvas, idListIt->mFeature.geometry(), vl );
           hl->setColor( QColor( 255, 0, 0 ) );
           hl->setWidth( 2 );
           mRubberBands.append( hl );
+          connect( vl, SIGNAL( destroyed() ), this, SLOT( layerDestroyed() ) );
         }
       }
     }
@@ -662,10 +663,22 @@ void QgsMapToolIdentify::handleMenuHover()
 
 void QgsMapToolIdentify::deleteRubberBands()
 {
-  QList<QgsHighlight*>::const_iterator it = mRubberBands.constBegin();
-  for ( ; it != mRubberBands.constEnd(); ++it )
-  {
-    delete *it;
-  }
-  mRubberBands.clear();
+  qDeleteAll( mRubberBands );
+}
+
+void QgsMapToolIdentify::layerDestroyed()
+{
+  QList<QgsHighlight*>::iterator it = mRubberBands.begin();
+  while ( it != mRubberBands.end() )
+  {
+    if (( *it )->layer() == sender() )
+    {
+      delete *it;
+      it = mRubberBands.erase( it );
+    }
+    else
+    {
+      ++it;
+    }
+  }
 }

src/gui/qgsmaptoolidentify.h

@@ -127,6 +127,7 @@ class GUI_EXPORT QgsMapToolIdentify : public QgsMapTool
 
   public slots:
     void formatChanged( QgsRasterLayer *layer );
+    void layerDestroyed();
 
   signals:
     void identifyProgress( int, int );