From kde-commits  Thu Jan 26 02:24:38 2012
From: Michael Pyne <mpyne () kde ! org>
Date: Thu, 26 Jan 2012 02:24:38 +0000
To: kde-commits
Subject: KDE/kdemultimedia/juk
Message-Id: <20120126022438.32E47AC892 () svn ! kde ! org>
X-MARC-Message: https://marc.info/?l=kde-commits&m=132754486513944

SVN commit 1275917 by mpyne:

Don't load a playlist if it's already found by folder scan.

The way file scanning is performed, it's possible for a playlist that is stored
with a .m3u file to be found and loaded before JuK has finished loading its
cached playlists.

There's a few ways to fix this, but the most conservative (especially for those
dealing with this bug for awhile) is to filter playlists as they are being
loaded from the cache and remove any that have already been loaded. This also does not
require a change to the QDataStream binary format used for saving playlists.

This should fix a bug that's been open for more than five years now... by the
way, anyone want to help with finding/fixing more JuK bugs? :D

BUG:113769


 M  +8 -0      cache.cpp  
 M  +9 -1      playlistcollection.h  


--- trunk/KDE/kdemultimedia/juk/cache.cpp #1275916:1275917
@@ -200,6 +200,14 @@
                     Playlist *p = new Playlist(collection, true);
                     createdPlaylists.append(p);
                     s >> *p;
+
+                    // We may have already read this playlist from the folder
+                    // scanner, if an .m3u playlist
+                    if(collection->containsPlaylistFile(p->fileName())) {
+                        delete p;
+                        p = 0;
+                    }
+
                     playlist = p;
                     break;
                 } // switch
--- trunk/KDE/kdemultimedia/juk/playlistcollection.h #1275916:1275917
@@ -152,6 +152,15 @@
     virtual void raise(Playlist *playlist);
 
     /**
+     * @return true, if a playlist with the file name given in @p file is
+     * already loaded into this collection, or false otherwise.
+     *
+     * @note @p file should be the "canonical" full path to the file to avoid
+     * problems with duplicates and symlinks.
+     */
+    bool containsPlaylistFile(const QString &file) const;
+
+    /**
      * This is used to put up a temporary widget over the top of the playlist
      * stack.  This is part of a trick to significantly speed up painting by
      * hiding the playlist to which items are being added.
@@ -167,7 +176,6 @@
     virtual void removePlaylist(Playlist *playlist) = 0;
 
     bool importPlaylists() const;
-    bool containsPlaylistFile(const QString &file) const;
 
     QString playlistNameDialog(const QString &caption = i18n("Create New Playlist"),
                                const QString &suggest = QString(),