Avoid crashes and hopefully data loss by handling multiple sync state resets

which previously led to the folder being closed prematurely, which in turn
might have caused corruption of the mmap'd index file. (Kolab Issue 1323)

svn path=/branches/KDE/3.5/kdepim/; revision=572899

kmfoldercachedimap.cpp

@@ -1208,6 +1208,10 @@ void KMFolderCachedImap::uploadFlags()
 
 void KMFolderCachedImap::slotImapStatusChanged(KMFolder* folder, const QString&, bool cont)
 {
+  if ( mSyncState == SYNC_STATE_INITIAL ){
+      kdDebug(5006) << "IMAP status changed but reset " << endl;
+      return; // we were reset
+  }
   if ( folder->storage() == this ) {
     --mStatusFlagsJobs;
     if ( mStatusFlagsJobs == 0 || !cont ) // done or aborting
@@ -2010,6 +2014,7 @@ KMFolderCachedImap::slotACLChanged( const QString& userId, int permissions )
 // called by KMAcctCachedImap::killAllJobs
 void KMFolderCachedImap::resetSyncState()
 {
+  if ( mSyncState == SYNC_STATE_INITIAL ) return;
   mSubfoldersForSync.clear();
   mSyncState = SYNC_STATE_INITIAL;
   close();