[layertree] Use writePath() for embedded groups (absolute vs relative path)

Author: wonder-sk

src/core/qgsproject.cpp

@@ -999,6 +999,24 @@ void QgsProject::loadEmbeddedNodes( QgsLayerTreeGroup* group )
   }
 }
 
+void QgsProject::updateEmbeddedGroupsProjectPath( QgsLayerTreeGroup* group )
+{
+  foreach ( QgsLayerTreeNode* node, group->children() )
+  {
+    if ( QgsLayerTree::isGroup( node ) )
+    {
+      if ( !node->customProperty( "embedded_project" ).toString().isEmpty() )
+      {
+        // may change from absolute path to relative path
+        QString newPath = writePath( node->customProperty( "embedded_project" ).toString() );
+        node->setCustomProperty( "embedded_project", newPath );
+      }
+      else
+        updateEmbeddedGroupsProjectPath( QgsLayerTree::toGroup( node ) );
+    }
+  }
+}
+
 
 bool QgsProject::read( QDomNode & layerNode )
 {
@@ -1080,6 +1098,7 @@ bool QgsProject::write()
   // write layer tree - make sure it is without embedded subgroups
   QgsLayerTreeNode* clonedRoot = mRootGroup->clone();
   QgsLayerTreeUtils::removeChildrenOfEmbeddedGroups( QgsLayerTree::toGroup( clonedRoot ) );
+  updateEmbeddedGroupsProjectPath( QgsLayerTree::toGroup( clonedRoot ) ); // convert absolute paths to relative paths if required
   clonedRoot->writeXML( qgisNode );
   delete clonedRoot;
 

src/core/qgsproject.h

@@ -357,6 +357,8 @@ class CORE_EXPORT QgsProject : public QObject
 
     void loadEmbeddedNodes( QgsLayerTreeGroup* group );
 
+    void updateEmbeddedGroupsProjectPath( QgsLayerTreeGroup* group );
+
   signals:
     //! emitted when project is being read
     void readProject( const QDomDocument & );