Reworks to the shuffle system to improve performance and allow fast shuffling from a big library (but this work for all database views)

This improvement brings a huge performance improvement to start a random mix of your library. Previously, the only way to do this was to increase the size of a playlist with absurd sizes number. Now it will respect the limitation but will insert random songs from the current view.

Database: Add true random songs in playlist if it is gonna exceed its maximum capacity

More context is available here : https://www.reddit.com/r/rockbox/comments/1ez0mq4/i_developped_true_full_library_shuffle_for/

Also :
- Improved layout in the DB browser
- New default max playlists capacity is now 2000 on old PortalPlayer targets to give a better user experience and not having to wait dozens of seconds while creating a playlist
- "Show insert shuffled" option is now true by default
- Add a new shortcut to play all songs shuffled in the DB browser
- Now the feature is fully optional and enabled only on targets that have more than 2MB of RAM
- Add entries about this feature in the manual to explain it to the users
Change-Id: I1aebaf7ebcff2bf907080f1861027d530619097c

Change-Id: I3354923b148eeef1975171990e814a1a505d1df0

1 files changed, 1 insertions, 0 deletions

diff --git a/apps/tagtree.h b/apps/tagtree.h
index 39ab545bd0..a57a5c2f80 100644
--- a/apps/tagtree.h
+++ b/apps/tagtree.h
@@ -45,6 +45,7 @@ char *tagtree_get_title(struct tree_context* c);
 int tagtree_get_attr(struct tree_context* c);
 int tagtree_get_icon(struct tree_context* c);
 int tagtree_get_filename(struct tree_context* c, char *buf, int buflen);
+int tagtree_get_custom_action(struct tree_context* c);
 bool tagtree_get_subentry_filename(char *buf, size_t bufsize);
 bool tagtree_subentries_do_action(bool (*action_cb)(const char *file_name));