[feature] filter the attribute table only if there is a selection (feature #7541)

Author: olivierdalang

src/gui/attributetable/qgsattributetablefiltermodel.cpp

@@ -177,7 +177,7 @@ bool QgsAttributeTableFilterModel::filterAcceptsRow( int sourceRow, const QModel
       return mFilteredFeatures.contains( masterModel()->rowToId( sourceRow ) );
 
     case ShowSelected:
-      return layer()->selectedFeaturesIds().contains( masterModel()->rowToId( sourceRow ) );
+      return layer()->selectedFeaturesIds().isEmpty() || layer()->selectedFeaturesIds().contains( masterModel()->rowToId( sourceRow ) );
 
     case ShowVisible:
       return mFilteredFeatures.contains( masterModel()->rowToId( sourceRow ) );