A flat dropdown doesn't scale to the hundreds of albums and smart
albums a library grows. crates/ui-egui/src/album_picker.rs is a
reusable picker:
- A button opens a popup with a search field, focused on open.
- With nothing typed it shows the sidebar's tree in the sidebar's order
(entries_from uses Catalog::album_children_by_parent): folders with
painted disclosure triangles and folder icons, album / smart-album
icons. Folders are closed except those holding the current choice.
- Typing lists the albums whose "Folder / Name" path holds every word,
in any case, names starting with the query first. ↑ / ↓ move, Enter
picks, Esc closes just the popup.
- Albums that can't be picked stay visible but greyed, the reason on
hover, instead of vanishing.
- Pure, unit-tested helpers: path_label, ancestors, visible_tree,
search, set_depths. Widget ids albumPicker / albumPickerSearch /
albumPickerFolder / albumPickerItem.
The rule editor's Album value uses it. The album being edited and
albums that would loop back are blocked with a reason ("This is the
album you're editing", "It tests this album, so testing it back would
loop"). This also removes the stray divider the old dropdown drew above
"Smart Albums" when no regular album preceded it. New strings are
translated in all seven locales, and the strict i18n test lists them;
the unused "Smart Albums" heading is dropped. Headless tests: browsing
the tree, typing with ↑ / Enter, greyed loops.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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