Fix processHash function

Fix processHash function to not use QVariantHash as result because of QJsonDocument doesn't support QVariantHash variables in Qt 5.

src/webui/btjson.cpp

@@ -156,7 +156,7 @@ static const char KEY_SUFFIX_REMOVED[] = "_removed";
 QVariantMap getTranserInfoMap();
 QVariantMap toMap(const QTorrentHandle& h);
 void processMap(QVariantMap prevData, QVariantMap data, QVariantMap &syncData);
-void processHash(QVariantHash prevData, QVariantHash data, QVariantHash &syncData, QVariantList &removedItems);
+void processHash(QVariantHash prevData, QVariantHash data, QVariantMap &syncData, QVariantList &removedItems);
 void processList(QVariantList prevData, QVariantList data, QVariantList &syncData, QVariantList &removedItems);
 QVariantMap generateSyncData(int acceptedResponseId, QVariantMap data, QVariantMap &lastAcceptedData,  QVariantMap &lastData);
 
@@ -589,10 +589,10 @@ void processMap(QVariantMap prevData, QVariantMap data, QVariantMap &syncData)
             }
             break;
         case QVariant::Hash: {
-                QVariantHash hash;
-                processHash(prevData[key].toHash(), data[key].toHash(), hash, removedItems);
-                if (!hash.isEmpty())
-                    syncData[key] = hash;
+                QVariantMap map;
+                processHash(prevData[key].toHash(), data[key].toHash(), map, removedItems);
+                if (!map.isEmpty())
+                    syncData[key] = map;
                 if (!removedItems.isEmpty())
                     syncData[key + KEY_SUFFIX_REMOVED] = removedItems;
             }
@@ -626,7 +626,7 @@ void processMap(QVariantMap prevData, QVariantMap data, QVariantMap &syncData)
 // Compare two lists of structures (prevData, data) and calculate difference (syncData, removedItems).
 // Structures encoded as map.
 // Lists are encoded as hash table (indexed by structure key value) to improve ease of searching for removed items.
-void processHash(QVariantHash prevData, QVariantHash data, QVariantHash &syncData, QVariantList &removedItems)
+void processHash(QVariantHash prevData, QVariantHash data, QVariantMap &syncData, QVariantList &removedItems)
 {
     // initialize output variables
     syncData.clear();
@@ -634,7 +634,8 @@ void processHash(QVariantHash prevData, QVariantHash data, QVariantHash &syncDat
 
     if (prevData.isEmpty()) {
         // If list was empty before, then difference is a whole new list.
-        syncData = data;
+        foreach (QString key, data.keys())
+            syncData[key] = data[key];
     }
     else {
         foreach (QString key, data.keys()) {