Fix functionality broken by commit 1c3e0630.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

amarok/src/playlist.cpp

@@ -3476,34 +3476,35 @@ Playlist::deleteSelectedFiles() //SLOT
 void
 Playlist::removeDuplicates() //SLOT
 {
-    // Remove dead entries:
-
-    for( TQListViewItemIterator it( this ); it.current(); ) {
-        PlaylistItem* item = static_cast<PlaylistItem*>( *it );
+    // Remove dead entries
+    for (TQListViewItemIterator it(this); it.current(); )
+    {
+        PlaylistItem *item = static_cast<PlaylistItem*>(*it);
         const KURL url = item->url();
-        if ( url.isLocalFile() && !TQFile::exists( url.path() ) ) {
-            removeItem( item );
+        if (url.isLocalFile() && !TQFile::exists(url.path()))
+        {
+            removeItem(item);
             ++it;
             delete item;
         }
         else ++it;
     }
 
-    // Remove dupes:
-
-    TQPtrList<PlaylistItem> list;
-    for( TQListViewItemIterator it( this ); it.current(); ++it )
-        list.prepend( static_cast<PlaylistItem*>( it.current() ) );
-
-    list.sort();
-
-    TQPtrListIterator<PlaylistItem> it( list );
-    PlaylistItem *item;
-    while( (item = it.current()) ) {
-        const KURL &compare = item->url();
-        ++it;
-        if ( *it && compare == it.current()->url() ) {
-            removeItem( item );
+    // Remove duplicates
+    TQMap<KURL, bool> existingItems;
+    for (TQListViewItemIterator it(this); it.current(); )
+    {
+        PlaylistItem *item = static_cast<PlaylistItem*>(*it);
+        const KURL &itemUrl = item->url();
+        if (!existingItems.contains(itemUrl))
+        {
+            existingItems[itemUrl] = true;
+            ++it;
+        }
+        else
+        {
+            removeItem(item);
+            ++it;
             delete item;
         }
     }