Merge pull request steemit#2343 from steemit/2337-get-account-history…

…-loop-2-master

Fix iteration in account_history_api.cpp steemit#2337 (master branch)

libraries/plugins/apis/account_history_api/account_history_api.cpp

@@ -62,13 +62,20 @@ DEFINE_API_IMPL( account_history_api_impl, get_account_history )
 
    const auto& idx = _db.get_index< chain::account_history_index, chain::by_account >();
    auto itr = idx.lower_bound( boost::make_tuple( args.account, args.start ) );
-   auto end = idx.upper_bound( boost::make_tuple( args.account, std::max( int64_t(0), int64_t(itr->sequence) - args.limit ) ) );
+   uint32_t n = 0;
 
    get_account_history_return result;
-   while( itr != end )
+   while( true )
    {
+      if( itr == idx.end() )
+         break;
+      if( itr->account != args.account )
+         break;
+      if( n >= args.limit )
+         break;
       result.history[ itr->sequence ] = _db.get( itr->op );
       ++itr;
+      ++n;
    }
 
    return result;