Update StringMatcher to react to QuerySearchPrecision changes

StringMatcher now listens to Settings.PropertyChanged and updates
UserSettingSearchPrecision when QuerySearchPrecision changes.
Removed direct assignment from Settings setter to centralize
update logic within StringMatcher.

Author: Jack251970

Flow.Launcher.Infrastructure/StringMatcher.cs

@@ -21,6 +21,16 @@ public StringMatcher(IAlphabet alphabet, Settings settings)
             _alphabet = alphabet;
             _settings = settings;
             UserSettingSearchPrecision = _settings.QuerySearchPrecision;
+
+            _settings.PropertyChanged += (sender, e) =>
+            {
+                switch (e.PropertyName)
+                {
+                    case nameof(Settings.QuerySearchPrecision):
+                        UserSettingSearchPrecision = _settings.QuerySearchPrecision;
+                        break;
+                }
+            };
         }
 
         // This is a workaround to allow unit tests to set the instance

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -1,9 +1,9 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Text.Json.Serialization;
 using System.Windows;
 using System.Windows.Media;
-using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.Infrastructure.Hotkey;
 using Flow.Launcher.Infrastructure.Logger;
 using Flow.Launcher.Infrastructure.Storage;
@@ -16,7 +16,8 @@ namespace Flow.Launcher.Infrastructure.UserSettings
     public class Settings : BaseModel, IHotkeySettings
     {
         private FlowLauncherJsonStorage<Settings> _storage;
-        private StringMatcher _stringMatcher = null;
+
+        public event EventHandler StringMatcherBehaviorChanged;
 
         public void SetStorage(FlowLauncherJsonStorage<Settings> storage)
         {
@@ -25,9 +26,6 @@ public void SetStorage(FlowLauncherJsonStorage<Settings> storage)
 
         public void Initialize()
         {
-            // Initialize dependency injection instances after Ioc.Default is created
-            _stringMatcher = Ioc.Default.GetRequiredService<StringMatcher>();
-
             // Initialize application resources after application is created
             var settingWindowFont = new FontFamily(SettingWindowFont);
             Application.Current.Resources["SettingWindowFont"] = settingWindowFont;
@@ -417,8 +415,7 @@ public SearchPrecisionScore QuerySearchPrecision
                 if (_querySearchPrecision != value)
                 {
                     _querySearchPrecision = value;
-                    if (_stringMatcher != null)
-                        _stringMatcher.UserSettingSearchPrecision = value;
+                    OnPropertyChanged();
                 }
             }
         }

Flow.Launcher.Plugin/Interfaces/IPublicAPI.cs

@@ -637,5 +637,10 @@ public interface IPublicAPI
         /// </summary>
         /// <returns></returns>
         string GetLogDirectory();
+
+        /// <summary>
+        /// Invoked when the behavior of string matcher has changed which can effect the result of <see cref="MatchResult"/>.
+        /// </summary>
+        event EventHandler StringMatcherBehaviorChanged;
     }
 }