fix(learn): Archived and Recently deleted fold during a search

A search opened both sections whatever they were set to, so a tap on
their headers did nothing while one was under way. A search still opens
them, so their matches show, and a tap now folds them until the search
ends, which brings them back as they were left before it.

Whats-New: While searching the library, Archived and Recently deleted fold again when tapped.
Whats-New-De: Beim Suchen in der Bibliothek lassen sich Archiviert und Zuletzt gelöscht wieder einklappen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/learn/halkyon_learn_flutter/lib/src/feature/studyset/widget/library_screen.dart

@@ -494,6 +494,20 @@ class _GridState() extends State<_Grid> {
   var _archiveOpen = false;
   var _deletedOpen = true;
 
+  /// Whether the sections are open during a search: each search opens
+  /// them, so their matches show, and a tap folds them until it ends.
+  var _archiveOpenInSearch = true;
+  var _deletedOpenInSearch = true;
+
+  @override
+  void didUpdateWidget(_Grid oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.query.isEmpty && widget.query.isNotEmpty) {
+      _archiveOpenInSearch = true;
+      _deletedOpenInSearch = true;
+    }
+  }
+
   static const _spacing = 12.0;
 
   // As many columns as fit cards up to 400 dp wide; every card as tall, so
@@ -594,10 +608,11 @@ class _GridState() extends State<_Grid> {
       for (final studyset in widget.deleted)
         if (listed(studyset)) studyset,
     ];
-    // A search opens the sections, so their matches show; closing the
+    // A search opens the sections, so their matches show, and a tap folds
-    // search brings them back as the person left them.
+    // them for the rest of it; closing the search brings them back as the
-    final archiveOpen = searching || _archiveOpen;
+    // person left them.
-    final deletedOpen = searching || _deletedOpen;
+    final archiveOpen = searching ? _archiveOpenInSearch : _archiveOpen;
+    final deletedOpen = searching ? _deletedOpenInSearch : _deletedOpen;
     // Pulled down, the library syncs.
     return AppRefreshIndicator(
       onRefresh: () => _syncNow(context),
@@ -655,7 +670,13 @@ class _GridState() extends State<_Grid> {
                 label: l10n.libraryArchivedSection,
                 count: archived.length,
                 open: archiveOpen,
-                onToggle: () => setState(() => _archiveOpen = !_archiveOpen),
+                onToggle: () => setState(() {
+                  if (searching) {
+                    _archiveOpenInSearch = !_archiveOpenInSearch;
+                  } else {
+                    _archiveOpen = !_archiveOpen;
+                  }
+                }),
               ),
             ),
             if (archiveOpen)
@@ -680,7 +701,13 @@ class _GridState() extends State<_Grid> {
                 label: l10n.libraryDeletedSection,
                 count: deleted.length,
                 open: deletedOpen,
-                onToggle: () => setState(() => _deletedOpen = !_deletedOpen),
+                onToggle: () => setState(() {
+                  if (searching) {
+                    _deletedOpenInSearch = !_deletedOpenInSearch;
+                  } else {
+                    _deletedOpen = !_deletedOpen;
+                  }
+                }),
               ),
             ),
             if (deletedOpen) ...[

apps/learn/halkyon_learn_flutter/test/feature/studyset/widget/library_screen_test.dart

@@ -683,6 +683,35 @@ void main() {
     expect(find.text('Kanji'), findsNothing, reason: 'the archive is closed');
   });
 
+  testWidgets('a search opens the archive, which a tap folds for the rest '
+      'of the search', (tester) async {
+    stored(
+      'kanji',
+      'Kanji',
+      secondaryTitle: 'Japanese',
+      archivedAt: DateTime.utc(2026, 10),
+    );
+    await showLibrary(tester);
+
+    await tester.tap(find.byTooltip('Search'));
+    await tester.pumpAndSettle();
+    await tester.enterText(find.byType(TextField), 'kan');
+    await tester.pumpAndSettle();
+    expect(find.text('Kanji'), findsOneWidget);
+
+    await tester.tap(find.text('Archived'));
+    await tester.pumpAndSettle();
+    expect(find.text('Kanji'), findsNothing);
+
+    await tester.enterText(find.byType(TextField), 'kanj');
+    await tester.pumpAndSettle();
+    expect(find.text('Kanji'), findsNothing, reason: 'still folded');
+
+    await tester.tap(find.text('Archived'));
+    await tester.pumpAndSettle();
+    expect(find.text('Kanji'), findsOneWidget);
+  });
+
   testWidgets('a search lists titles starting with what is typed first, then '
       'those holding it as a word, then secondary titles, whatever was changed '
       'last', (tester) async {