Fix for dateline labeling problems

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@14352 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/core/pal/layer.cpp

@@ -236,7 +236,9 @@ namespace pal
     if ( hashtable->find( geom_id ) )
     {
       modMutex->unlock();
-      throw new PalException::FeatureExists();
+      //A feature with this id already exists. Don't throw an exception as sometimes,
+      //the same feature is added twice (dateline split with otf-reprojection)
+      return false;
     }
 
     // Split MULTI GEOM and Collection in simple geometries

src/core/pal/pal.cpp

@@ -167,8 +167,6 @@ namespace pal
 
   Layer * Pal::addLayer( const char *lyrName, double min_scale, double max_scale, Arrangement arrangement, Units label_unit, double defaultPriority, bool obstacle, bool active, bool toLabel )
   {
-
-
     Layer *lyr;
     lyrsMutex->lock();
 
@@ -183,7 +181,9 @@ namespace pal
       if ( strcmp(( *it )->name, lyrName ) == 0 )   // if layer already known
       {
         lyrsMutex->unlock();
-        throw new PalException::LayerExists();
+        //There is already a layer with this name, so we just return the existing one.
+        //Sometimes the same layer is added twice (e.g. datetime split with otf-reprojection)
+        return *it;
       }
     }