Make File -> "Empty all trash folders" work for imap trash folders by

not only expunging (in the imap sense) but also setting the \DELETED flag
of all messages in the folder because otherwise (imap) expunge does
nothing and only the local cache is removed. Confusion between the KMail
and the IMAP meaning of "expunge", I guess.

svn path=/trunk/kdepim/; revision=336842

kmfolderimap.cpp

@@ -1788,8 +1788,25 @@ QValueList<ulong> KMFolderImap::splitSets(const QString uids)
 //-----------------------------------------------------------------------------
 int KMFolderImap::expungeContents()
 {
+  // nuke the local cache
   int rc = KMFolderMbox::expungeContents();
-  if (autoExpunge())
+
+  // set the deleted flag for all messages in the folder
+  KURL url = mAccount->getUrl();
+  url.setPath( imapPath() + ";UID=1:*");
+  if ( mAccount->makeConnection() == ImapAccountBase::Connected ) {
+    KIO::SimpleJob *job = KIO::file_delete(url, FALSE);
+    KIO::Scheduler::assignJobToSlave(mAccount->slave(), job);
+    ImapAccountBase::jobData jd( url.url(), 0 );
+    jd.quiet = true;
+    mAccount->insertJob(job, jd);
+    connect(job, SIGNAL(result(KIO::Job *)),
+            mAccount, SLOT(slotSimpleResult(KIO::Job *)));
+  }
+  /* Is the below correct? If we are expunging (in the folder sense, not the imap sense),
+     why delete but not (imap-)expunge? Since the folder is not active there is no concept
+     of "leaving the folder", so the setting really has little to do with it. */
+  // if ( autoExpunge() )
     expungeFolder(this, true);
   getFolder();