Fix undo move mail. And add dialog when there is a error

(cherry picked from commit 71adab0d59a22b7e122a18bedf7b358f2207c7ad)

undostack.cpp

@@ -23,7 +23,7 @@
 
 #include "kmmainwin.h"
 #include "kmkernel.h"
-
+#include <KJob>
 #include <akonadi/itemmovejob.h>
 
 #include <kmessagebox.h>
@@ -90,8 +90,8 @@ void UndoStack::undo()
   {
     UndoInfo *info = mStack.takeFirst();
     emit undoStackChanged();
-    Akonadi::ItemMoveJob( info->items, info->srcFolder, this );
-    // TODO: handle job error?
+    Akonadi::ItemMoveJob * job = new Akonadi::ItemMoveJob( info->items, info->srcFolder, this );
+    connect( job, SIGNAL(result(KJob*)), this, SLOT(slotMoveResult(KJob*)) );
     delete info;
   }
   else
@@ -101,6 +101,12 @@ void UndoStack::undo()
   }
 }
 
+void UndoStack::slotMoveResult( KJob *job )
+{
+  if ( job->error() )
+    KMessageBox::sorry( kmkernel->mainWin(), i18n("Can not move message. %1").arg( job->errorString() ) );
+}
+
 void
 UndoStack::pushSingleAction(const Akonadi::Item &item, const Akonadi::Collection &folder, const Akonadi::Collection &destFolder)
 {

undostack.h

@@ -26,6 +26,8 @@
 #include <QObject>
 #include <akonadi/collection.h>
 #include <akonadi/item.h>
+class KJob;
+
 namespace KMail {
 
 /** A class for storing Undo information. */
@@ -58,6 +60,9 @@ public:
 public slots:
   void msgDestroyed( const Akonadi::Item &msg);
 
+protected slots:
+  void slotMoveResult(KJob*);
+  
 protected:
   QList<UndoInfo*> mStack;
   int mSize;