[libcontacts] Update partial contact correctly

Using the nemomobile contacts engine, a partially fetched contact will
always contain the detail types from the main contact table, even if
they are not included in the detail mask.  Therefore, they should not
be copied from the existing cache item if already present.

src/seasidecache.cpp

@@ -63,6 +63,7 @@
 #include <QContactPhoneNumber>
 #include <QContactGlobalPresence>
 #include <QContactSyncTarget>
+#include <QContactTimestamp>
 
 #include <QVersitContactExporter>
 #include <QVersitContactImporter>
@@ -187,19 +188,29 @@ QContactFetchHint presenceFetchHint()
     return fetchHint;
 }
 
-QContactFetchHint metadataFetchHint(quint32 fetchTypes = 0)
+DetailList contactsTableDetails()
 {
-    QContactFetchHint fetchHint(basicFetchHint());
-
-    // Include all detail types which come from the main contacts table
     DetailList types;
+
+    // These details are reported in every query
     types << detailType<QContactSyncTarget>() <<
              detailType<QContactName>() <<
              detailType<QContactDisplayLabel>() <<
              detailType<QContactFavorite>() <<
+             detailType<QContactTimestamp>() <<
              detailType<QContactGender>() <<
              detailType<QContactStatusFlags>();
 
+    return types;
+}
+
+QContactFetchHint metadataFetchHint(quint32 fetchTypes = 0)
+{
+    QContactFetchHint fetchHint(basicFetchHint());
+
+    // Include all detail types which come from the main contacts table
+    DetailList types(contactsTableDetails());
+
     // Include nickname, as some contacts have no other name
     types << detailType<QContactNickname>();
 
@@ -2206,7 +2217,13 @@ void updateDetailsFromCache(QContact &contact, SeasideCache::CacheItem *item, co
 {
     // Copy any existing detail types that are in the current record to the new instance
     foreach (const QContactDetail &existing, item->contact.details()) {
-        if (!queryDetailTypes.contains(detailType(existing))) {
+        const DetailTypeId existingType(detailType(existing));
+
+        static const DetailList contactsTableTypes(contactsTableDetails());
+
+        // The queried contact already contains any types in the contacts table, and those
+        // types explicitly fetched by the query
+        if (!queryDetailTypes.contains(existingType) && !contactsTableTypes.contains(existingType)) {
             QContactDetail copy(existing);
             contact.saveDetail(&copy);
         }