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add a one-step undo and harden queue edits

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austinried
2026-10-04 00:29:51 +00:00
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docs/architecture.md
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@@ -88,7 +88,7 @@ Because the resolver reports *which entry* a position falls in, `PlaybackState`
Stream URLs come from `SourceRepository.streamUri`, which asks the active `SubsonicSource` for a freshly salted `stream` URL; because the URL changes every request, artwork is attached to the media item by identity (the `CoverArtRef` cache key) rather than by URL.
The window is also the queue the media notification and Android Auto can browse — a deliberate trade-off, since the alternative is holding an entire large library in memory. The queue view resolves positions lazily too: it pages with queries bounded to one page per entry (never the whole queue) and rewrites `queue_entries` to edit. Removing a position splits its entry into up to two ranges, and moving one turns the moved track into an explicit song entry inserted at the target index, so an edit costs a couple of rows rather than a copy of the queue. When the edit falls inside the player's window the controller mirrors it with `removeMediaItem`/`moveMediaItem` so playback is not interrupted; a move that crosses the window boundary reloads the window around the cursor at the current position. Timed lyrics/gapless format preferences, scrobbling, downloads and adding to the queue from the library are not wired yet.
The window is also the queue the media notification and Android Auto can browse — a deliberate trade-off, since the alternative is holding an entire large library in memory. The queue view resolves positions lazily too: it pages with queries bounded to one page per entry (never the whole queue) and rewrites `queue_entries` to edit. Removing a position splits its entry into up to two ranges, and moving one turns the moved track into an explicit song entry inserted at the target index, so an edit costs a couple of rows rather than a copy of the queue. When the edit falls inside the player's window the controller mirrors it with `removeMediaItem`/`moveMediaItem` so playback is not interrupted; removing the playing track, or a move that crosses the window boundary, reloads the window around the cursor. The controller keeps the pre-edit entries and cursor, so the queue view can offer a one-step undo. Timed lyrics/gapless format preferences, scrobbling, downloads and adding to the queue from the library are not wired yet.
## Data model