tdf#158237 Use C++20 contains() instead of find() and end()

Change-Id: I596245603c0945438a940465122cb4c3e6954e81
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177140
Tested-by: Jenkins
Reviewed-by: David Gilbert <freedesktop@treblig.org>

xmloff/source/text/txtlists.cxx

@@ -138,8 +138,7 @@ void XMLTextListsHelper::KeepListAsProcessed( const OUString& sListId,
         mpMapListIdToListStyleDefaultListId = std::make_unique<tMapForLists>();
     }
 
-    if ( mpMapListIdToListStyleDefaultListId->find( sListStyleName ) ==
-                            mpMapListIdToListStyleDefaultListId->end() )
+    if ( !mpMapListIdToListStyleDefaultListId->contains( sListStyleName ) )
     {
         (*mpMapListIdToListStyleDefaultListId)[ sListStyleName ] =
             ::std::pair<OUString, OUString>(sListId, sListStyleDefaultListId);
@@ -153,7 +152,7 @@ bool XMLTextListsHelper::IsListProcessed( const OUString& sListId ) const
         return false;
     }
 
-    return mpProcessedLists->find( sListId ) != mpProcessedLists->end();
+    return mpProcessedLists->contains( sListId );
 }
 
 const OUString & XMLTextListsHelper::GetListStyleOfProcessedList(
@@ -212,7 +211,7 @@ OUString XMLTextListsHelper::GenerateNewListId() const
     if ( mpProcessedLists )
     {
         tools::Long nHitCount = 0;
-        while ( mpProcessedLists->find( sNewListId ) != mpProcessedLists->end() )
+        while ( mpProcessedLists->contains( sNewListId ) )
         {
             ++nHitCount;
             sNewListId = sTmpStr + OUString::number( nHitCount );