feat: Improve library search screen (#477)

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/util/map_bool_helper.dart

@@ -37,15 +37,30 @@ extension MapExtensions<T> on Map<T, bool> {
   bool get hasEnabled => values.any((element) => element == true);
 
   //Replaces only keys that exist with the new values
-  Map<T, bool> replaceMap(Map<T, bool> oldMap) {
+  Map<T, bool> replaceMap(Map<T, bool> oldMap, {bool enabledOnly = false}) {
+    if (oldMap.isEmpty) return this;
+
     Map<T, bool> result = {};
 
     forEach((key, value) {
-      result[key] = oldMap[key] ?? false;
+      if (enabledOnly) {
+        if (oldMap[key] == true) {
+          result[key] = true;
+        } else {
+          result[key] = value;
+        }
+      } else {
+        result[key] = oldMap[key] ?? false;
+      }
     });
 
     return result;
   }
+
+  Map<T, bool> sortByKey(String Function(T value) keySelector) {
+    final sortedEntries = entries.toList()..sort((a, b) => keySelector(a.key).compareTo(keySelector(b.key)));
+    return Map<T, bool>.fromEntries(sortedEntries);
+  }
 }
 
 extension MapExtensionsGeneric<K, V> on Map<K, V> {

lib/util/position_provider.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/widgets.dart';
+
+enum PositionContext { first, middle, last }
+
+class PositionProvider extends InheritedWidget {
+  final PositionContext position;
+
+  const PositionProvider({
+    required this.position,
+    required super.child,
+    super.key,
+  });
+
+  static PositionContext of(BuildContext context) {
+    final provider = context.dependOnInheritedWidgetOfExactType<PositionProvider>();
+    assert(provider != null, 'No PositionProvider found in context');
+    return provider?.position ?? PositionContext.middle;
+  }
+
+  @override
+  bool updateShouldNotify(PositionProvider oldWidget) => position != oldWidget.position;
+}