v0.20.4: the song that wasn't there

trav couldn't play the first track of his playlist. Shuffle off gave him song
two; shuffle on gave him a random one. The player was right both times:
library.json named a song whose file was not on the device, and skipping an
unplayable file advances one slot. Tapping any song that *is* there plays
exactly that song, shuffle or not.

The file was missing because a gvfs-MTP mount can hold a phantom directory --
one it lists happily while the device has no such folder. Every write into it
fails EIO, and mkdir(exist_ok=True) sees the phantom and does nothing, so it
never heals; only remounting clears it. That folder was new because Round 52's
retag moved the file under a new artist.

So a copy that raises OSError now costs that song, not the sync, and the song
is left out of the m3u and library.json. Aborting cost 2,400 songs for one
folder; counting it present anyway put a song in the manifest that isn't on
the device, which is the bug you could hear. The names come back in the
summary and a dialog rather than vanishing.

Planning is a worker now. plan_andtunes_sync is pure and writes nothing, but
it walks every file on the device, and over MTP that is thousands of round
trips -- on the GUI thread it froze the window and GNOME offered to kill
LinTunes, which is how a sync got force-quit halfway through.

And the sync stopped going quiet at the end. "Album art 501/501" is emitted
before the last album, and then _write_index, _ship_buttons and
_prune_empty_dirs ran silently: 501 exists() stats over MTP, ~840 KB of
writes and a full tree walk, with the progress line frozen. They report now,
and _write_index reads Art/ in one listing instead of a stat per album.

andTunes 0.2.2: the wheel scrolls the other way in lists, and smoothly --
a detent adds to a pixel debt that a Choreographer callback pays off a
fraction per frame, so one detent eases to a stop and a fast spin blends into
one movement instead of teleporting a row at a time. Volume is unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SKXUgsBBwe3qaHEjeV8ubP

andtunes/build.py

@@ -26,8 +26,8 @@ import sys
 import zipfile
 from pathlib import Path
 
-VERSION_NAME = "0.2.1"
-VERSION_CODE = 3
+VERSION_NAME = "0.2.2"
+VERSION_CODE = 4
 
 PACKAGE = "me.teafry.andtunes"
 MIN_SDK = 26