Always call UpdatedBlockTip, even if blocks were only disconnected

src/main.cpp

@@ -3028,7 +3028,6 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
         const CBlockIndex *pindexFork;
         std::list<CTransaction> txConflicted;
         bool fInitialDownload;
-        int nNewHeight;
         {
             LOCK(cs_main);
             CBlockIndex *pindexOldTip = chainActive.Tip();
@@ -3051,13 +3050,10 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
             pindexNewTip = chainActive.Tip();
             pindexFork = chainActive.FindFork(pindexOldTip);
             fInitialDownload = IsInitialBlockDownload();
-            nNewHeight = chainActive.Height();
         }
         // When we reach this point, we switched to a new tip (stored in pindexNewTip).
 
         // Notifications/callbacks that can run without cs_main
-        if(connman)
-            connman->SetBestHeight(nNewHeight);
 
         // throw all transactions though the signal-interface
         // while _not_ holding the cs_main lock
@@ -3069,12 +3065,12 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
         for(unsigned int i = 0; i < txChanged.size(); i++)
             SyncWithWallets(std::get<0>(txChanged[i]), std::get<1>(txChanged[i]), std::get<2>(txChanged[i]));
 
+        // Notify external listeners about the new tip.
+        GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork, fInitialDownload);
+
         // Always notify the UI if a new block tip was connected
         if (pindexFork != pindexNewTip) {
             uiInterface.NotifyBlockTip(fInitialDownload, pindexNewTip);
-
-            // Notify external listeners about the new tip.
-            GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork, fInitialDownload);
         }
     } while (pindexNewTip != pindexMostWork);
     CheckBlockIndex(chainparams.GetConsensus());
@@ -4665,6 +4661,7 @@ std::string GetWarnings(const std::string& strFor)
 
 void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) {
     const int nNewHeight = pindexNew->nHeight;
+    connman->SetBestHeight(nNewHeight);
 
     if (!fInitialDownload) {
         // Find the hashes of all blocks that weren't previously in the best chain.

src/zmq/zmqnotificationinterface.cpp

@@ -126,7 +126,7 @@ void CZMQNotificationInterface::Shutdown()
 
 void CZMQNotificationInterface::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload)
 {
-    if (fInitialDownload)
+    if (fInitialDownload || pindexNew == pindexFork) // In IBD or blocks were disconnected without any new ones
         return;
 
     for (std::list<CZMQAbstractNotifier*>::iterator i = notifiers.begin(); i!=notifiers.end(); )