protocol: fix syncing from peers being too choosy about peers

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -1723,7 +1723,7 @@ skip:
       return false;
     }
     const uint32_t local_stripe = tools::get_pruning_stripe(m_core.get_blockchain_pruning_seed());
-    if (m_sync_pruned_blocks && peer_stripe == local_stripe)
+    if (m_sync_pruned_blocks && local_stripe && next_stripe != local_stripe)
     {
       MDEBUG(context << "We can sync pruned blocks off this peer, not dropping");
       return false;
@@ -1836,7 +1836,7 @@ skip:
           next_block_height = next_needed_height;
         else
           next_block_height = context.m_last_response_height - context.m_needed_objects.size() + 1;
-        bool stripe_proceed_main = ((m_sync_pruned_blocks && peer_stripe == local_stripe) || add_stripe == 0 || peer_stripe == 0 || add_stripe == peer_stripe) && (next_block_height < bc_height + BLOCK_QUEUE_FORCE_DOWNLOAD_NEAR_BLOCKS || next_needed_height < bc_height + BLOCK_QUEUE_FORCE_DOWNLOAD_NEAR_BLOCKS);
+        bool stripe_proceed_main = ((m_sync_pruned_blocks && local_stripe && add_stripe != local_stripe) || add_stripe == 0 || peer_stripe == 0 || add_stripe == peer_stripe) && (next_block_height < bc_height + BLOCK_QUEUE_FORCE_DOWNLOAD_NEAR_BLOCKS || next_needed_height < bc_height + BLOCK_QUEUE_FORCE_DOWNLOAD_NEAR_BLOCKS);
         bool stripe_proceed_secondary = tools::has_unpruned_block(next_block_height, context.m_remote_blockchain_height, context.m_pruning_seed);
         bool proceed = stripe_proceed_main || (queue_proceed && stripe_proceed_secondary);
         if (!stripe_proceed_main && !stripe_proceed_secondary && should_drop_connection(context, tools::get_pruning_stripe(next_block_height, context.m_remote_blockchain_height, CRYPTONOTE_PRUNING_LOG_STRIPES)))
@@ -2043,7 +2043,7 @@ skip:
           const uint32_t peer_stripe = tools::get_pruning_stripe(context.m_pruning_seed);
           const uint32_t first_stripe = tools::get_pruning_stripe(span.first, context.m_remote_blockchain_height, CRYPTONOTE_PRUNING_LOG_STRIPES);
           const uint32_t last_stripe = tools::get_pruning_stripe(span.first + span.second - 1, context.m_remote_blockchain_height, CRYPTONOTE_PRUNING_LOG_STRIPES);
-          if ((first_stripe && peer_stripe != first_stripe) || (last_stripe && peer_stripe != last_stripe))
+          if ((((first_stripe && peer_stripe != first_stripe) || (last_stripe && peer_stripe != last_stripe)) && !m_sync_pruned_blocks) || (m_sync_pruned_blocks && req.prune))
           {
             MDEBUG(context << "We need full data, but the peer does not have it, dropping peer");
             return false;