Forward port of commit 733841 from 3.5 branch:

Fix "After compact action mail list disappears", by ensuring that the 
folder is open in the two places where it may be needed.  Not such a major
issue now that maildir is the recommended format and mandatory for the
standard folders.
  
CCBUG:146967 

svn path=/trunk/KDE/kdepim/; revision=733843

compactionjob.cpp

@@ -66,7 +66,7 @@ void MboxCompactionJob::kill()
   Q_ASSERT( mCancellable );
   // We must close the folder if we opened it and got interrupted
   if ( mFolderOpen && mSrcFolder && mSrcFolder->storage() ) {
-    mSrcFolder->storage()->close( "mboxcompactjob" );
+    mSrcFolder->storage()->close( "mboxcompact" );
   }
 
   if ( mTmpFile ) {
@@ -128,7 +128,7 @@ int MboxCompactionJob::executeNow( bool silent )
     return errno;
   }
   mOpeningFolder = true; // Ignore open-notifications while opening the folder
-  storage->open( "mboxcompactjob" );
+  storage->open( "mboxcompact" );
   mOpeningFolder = false;
   mFolderOpen = true;
   mOffset = 0;

kmheaders.cpp

@@ -2513,6 +2513,8 @@ int KMHeaders::currentItemIndex()
 //-----------------------------------------------------------------------------
 void KMHeaders::setCurrentItemByIndex(int msgIdx)
 {
+  if ( !mFolder->isOpened() ) setFolder( mFolder );
+
   if ((msgIdx >= 0) && (msgIdx < (int)mItems.size())) {
     clearSelection();
     bool unchanged = (currentItem() == mItems[msgIdx]);
@@ -2521,6 +2523,7 @@ void KMHeaders::setCurrentItemByIndex(int msgIdx)
     setSelectionAnchor( currentItem() );
     if (unchanged)
        highlightMessage( mItems[msgIdx], false);
+    makeHeaderVisible();
   }
 }
 
@@ -3019,6 +3022,9 @@ SortCacheItem* KMHeaders::findParentBySubject(SortCacheItem *item)
 bool KMHeaders::readSortOrder( bool set_selection, bool forceJumpToUnread )
 {
     //kDebug(5006) << endl << kBacktrace();
+
+    if ( !mFolder->isOpened() ) mFolder->open( "kmheaders" );
+
     //all cases
     qint32 column, ascending, threaded, discovered_count, sorted_count, appended;
     qint32 deleted_count = 0;