Fix Meta Autocomplete ranking

.. when using '*' for values we autocomplete based upon
   previously entered values for the field, but we didn't
   take into account ranking.

.. now the autocomplete list is ranked to most popular values
   complete first.

src/RideCache.cpp

@@ -698,20 +698,40 @@ RideCache::getRankedValues(QString field)
         QString value = item->metadata().value(field, "");
         if (value != "") {
             int count = returning.value(value,0);
-            returning.insert(value,count);
+            returning.insert(value,++count);
         }
     }    
     return returning;
 }
 
+class OrderedList {
+    public:
+        OrderedList(QString string, int rank) : string(string), rank(rank) {}
+        QString string;
+        int rank;
+};
+
+bool rideCacheOrderListGreaterThan(const OrderedList a, const OrderedList b) { return a.rank > b.rank; }
+
 QStringList
 RideCache::getDistinctValues(QString field)
 {
     QStringList returning;
+
+    // ranked
     QHashIterator<QString,int> i(getRankedValues(field));
+    QList<OrderedList> ranked;
     while(i.hasNext()) {
         i.next();
-        returning << i.key();
+        ranked << OrderedList(i.key(), i.value());
     }
+
+    // sort from big to small
+    qSort(ranked.begin(), ranked.end(), rideCacheOrderListGreaterThan);
+
+    // extract ordered values
+    foreach(OrderedList x, ranked)
+        returning << x.string;
+
     return returning;
 }