Bitcoin-Qt: emit numBlocksChanged for changed reindex or importing state

- this allows our progressbarlabel to correctly update, when we
  finish a reindex or import, but do not get new blocks from other sources

src/qt/clientmodel.cpp

@@ -17,7 +17,9 @@ static const int64 nClientStartupTime = GetTime();
 
 ClientModel::ClientModel(OptionsModel *optionsModel, QObject *parent) :
     QObject(parent), optionsModel(optionsModel),
-    cachedNumBlocks(0), cachedNumBlocksOfPeers(0), numBlocksAtStartup(-1), pollTimer(0)
+    cachedNumBlocks(0), cachedNumBlocksOfPeers(0),
+    cachedReindexing(0), cachedImporting(0),
+    numBlocksAtStartup(-1), pollTimer(0)
 {
     pollTimer = new QTimer(this);
     pollTimer->setInterval(MODEL_UPDATE_DELAY);
@@ -70,10 +72,14 @@ void ClientModel::updateTimer()
     int newNumBlocks = getNumBlocks();
     int newNumBlocksOfPeers = getNumBlocksOfPeers();
 
-    if(cachedNumBlocks != newNumBlocks || cachedNumBlocksOfPeers != newNumBlocksOfPeers)
+    // check for changed number of blocks we have, number of blocks peers claim to have, reindexing state and importing state
+    if (cachedNumBlocks != newNumBlocks || cachedNumBlocksOfPeers != newNumBlocksOfPeers ||
+        cachedReindexing != fReindex || cachedImporting != fImporting)
     {
         cachedNumBlocks = newNumBlocks;
         cachedNumBlocksOfPeers = newNumBlocksOfPeers;
+        cachedReindexing = fReindex;
+        cachedImporting = fImporting;
 
         // ensure we return the maximum of newNumBlocksOfPeers and newNumBlocks to not create weird displays in the GUI
         emit numBlocksChanged(newNumBlocks, std::max(newNumBlocksOfPeers, newNumBlocks));

src/qt/clientmodel.h

@@ -60,6 +60,8 @@ private:
 
     int cachedNumBlocks;
     int cachedNumBlocksOfPeers;
+	bool cachedReindexing;
+	bool cachedImporting;
 
     int numBlocksAtStartup;