[OGR provider] Run addFeatures() and deleteFeatures() within transaction

src/providers/ogr/qgsogrprovider.cpp

@@ -1319,6 +1319,8 @@ bool QgsOgrProvider::addFeatures( QgsFeatureList &flist )
 
   setRelevantFields( ogrLayer, true, attributeIndexes() );
 
+  const bool inTransaction = startTransaction();
+
   bool returnvalue = true;
   for ( QgsFeatureList::iterator it = flist.begin(); it != flist.end(); ++it )
   {
@@ -1328,6 +1330,11 @@ bool QgsOgrProvider::addFeatures( QgsFeatureList &flist )
     }
   }
 
+  if ( inTransaction )
+  {
+    commitTransaction();
+  }
+
   if ( !syncToDisc() )
   {
     returnvalue = false;
@@ -1818,6 +1825,8 @@ bool QgsOgrProvider::deleteFeatures( const QgsFeatureIds &id )
   if ( !doInitialActionsForEdition() )
     return false;
 
+  const bool inTransaction = startTransaction();
+
   bool returnvalue = true;
   for ( QgsFeatureIds::const_iterator it = id.begin(); it != id.end(); ++it )
   {
@@ -1827,6 +1836,11 @@ bool QgsOgrProvider::deleteFeatures( const QgsFeatureIds &id )
     }
   }
 
+  if ( inTransaction )
+  {
+    commitTransaction();
+  }
+
   if ( !syncToDisc() )
   {
     returnvalue = false;