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/TASKS.md

@@ -11,7 +11,10 @@ Legend: `[ ]` todo · `[~]` in progress · `[x]` done.
 `Library.group()` keyed albums case-folded but artists raw-case, so one artist
 spelled two ways on one album ("RJD2" / "Rjd2") took the whole library down
 with `Couldn't read library.json`. Both maps fold case now, and `Artist` has a
-`key` the way `Album` always did.** What's left is the *Parked* list, pulled in
+`key` the way `Album` always did. 0.2.2 (round 55, 2026-09-14) reversed the
+wheel in lists and made it scroll smoothly (`WheelScroll` — a pixel debt paid
+off per frame, not a row per detent); volume on the other screens is
+unchanged.** What's left is the *Parked* list, pulled in
 as trav finds he needs it. Built with
 `python3 andtunes/build.py` — plain Java, no Gradle, nothing downloaded (see
 `README.md`, *Toolchain*). Phases are andTunes' own; which LinTunes round