db: fix broken command "list ... group"

Grouping in the "list" command was completely broken from the start, unlike "count group". I have no idea what I have been thinking when I wrote commit ae178c77bd, but it didn't make any sense. This commit is a rewrite of the feature. For clients to be able to detect this feature, this commit also increments the protocol version.
2018-10-22 11:35:22 +02:00
parent 7cfe929c36
commit db27bb76e2
15 changed files with 145 additions and 332 deletions
--- a/1
+++ b/1
@@ -2,6 +2,7 @@ ver 0.20.22 (not yet released)
 * protocol
  - add tag fallbacks for AlbumArtistSort, ArtistSort
  - "count group ..." can print an empty group
+  - fix broken command "list ... group"
 * storage
  - curl: URL-encode paths
 * Android