playlist: Simplify playlist modified detection

Any modifications to the playlist (insert, delete, shuffle, etc)
will cause the modified flag to be set. The flag is cleared when
the playlist is saved. Code that generates playlists can manually
clear the modified flag if appropriate; there is now a proper API
for this so the tagcache and pictureflow don't need to resort to
hacks.

Change-Id: I8d3c723265a41db07a13de3f1d2abb0444528d57

1 files changed, 1 insertions, 0 deletions

diff --git a/apps/plugin.h b/apps/plugin.h
index cf6a1bc4e4..c54ef180ec 100644
--- a/apps/plugin.h
+++ b/apps/plugin.h
@@ -954,6 +954,7 @@ struct plugin_api {
     bool (*tagtree_subentries_do_action)(bool (*action_cb)(const char *file_name));
 #endif
     void (*adjust_volume)(int steps);
+    void (*playlist_set_modified)(struct playlist_info *playlist, bool modified);
 };
 
 /* plugin header */