start with empty list instead of copy

src/OpenFOAM/containers/Lists/ListOps/ListOps.H

@@ -73,7 +73,7 @@ void inplaceReorder(const UList<label>& oldToNew, ListType&);
 template<class Container>
 void inplaceMapValue(const UList<label>& oldToNew, Container&);
 
-//- Recreate with mapped keys. Remove elements with negative key.
+//- Recreate with mapped keys. Do not map elements with negative key.
 template<class Container>
 void inplaceMapKey(const UList<label>& oldToNew, Container&);
 

src/OpenFOAM/containers/Lists/ListOps/ListOpsTemplates.C

@@ -147,7 +147,7 @@ void Foam::inplaceMapKey
     Container& lst
 )
 {
-    Container newLst(lst);
+    Container newLst(lst.size());
 
     for
     (