Add StringMatcherBehaviorChanged event to Settings

Introduce StringMatcherBehaviorChanged event in Settings, triggered on changes to string matching properties. Expose the event via PublicAPIInstance for plugin subscriptions. Update Program plugin to reset cache on event, and ensure proper event unsubscription in Dispose. Refactor IgnoreAccents property for consistency.

Author: Jack251970

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.ComponentModel;
 using System.Text.Json.Serialization;
 using System.Windows;
 using System.Windows.Media;
@@ -30,6 +31,22 @@ public void Initialize()
             var settingWindowFont = new FontFamily(SettingWindowFont);
             Application.Current.Resources["SettingWindowFont"] = settingWindowFont;
             Application.Current.Resources["ContentControlThemeFontFamily"] = settingWindowFont;
+
+            PropertyChanged += Settings_PropertyChanged;
+        }
+
+        private void Settings_PropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            switch (e.PropertyName)
+            {
+                case nameof(QuerySearchPrecision):
+                case nameof(ShouldUsePinyin):
+                case nameof(UseDoublePinyin):
+                case nameof(DoublePinyinSchema):
+                case nameof(IgnoreAccents):
+                    StringMatcherBehaviorChanged?.Invoke(this, EventArgs.Empty);
+                    break;
+            }
         }
 
         public void Save()
@@ -357,20 +374,6 @@ public bool ShouldUsePinyin
             }
         }
 
-        private bool _IgnoreAccents = false;
-        public bool IgnoreAccents
-        {
-            get => _IgnoreAccents;
-            set
-            {
-                if (_IgnoreAccents != value)
-                {
-                    _IgnoreAccents = value;
-                    OnPropertyChanged();
-                }
-            }
-        }
-
         private bool _useDoublePinyin = false;
         public bool UseDoublePinyin
         {
@@ -420,6 +423,20 @@ public SearchPrecisionScore QuerySearchPrecision
             }
         }
 
+        private bool _IgnoreAccents = false;
+        public bool IgnoreAccents
+        {
+            get => _IgnoreAccents;
+            set
+            {
+                if (_IgnoreAccents != value)
+                {
+                    _IgnoreAccents = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
         public bool AutoUpdates { get; set; } = false;
 
         public double WindowLeft { get; set; }

Flow.Launcher/PublicAPIInstance.cs

@@ -623,6 +623,12 @@ public event ActualApplicationThemeChangedEventHandler ActualApplicationThemeCha
 
         public string GetLogDirectory() => DataLocation.VersionLogDirectory;
 
+        public event EventHandler StringMatcherBehaviorChanged
+        {
+            add => _settings.StringMatcherBehaviorChanged += value;
+            remove => _settings.StringMatcherBehaviorChanged -= value;
+        }
+
         #endregion
 
         #region Private Methods

Plugins/Flow.Launcher.Plugin.Program/Main.cs

@@ -327,13 +327,22 @@ static void MoveFile(string sourcePath, string destinationPath)
                 WatchProgramUpdate();
             }
 
+            Context.API.StringMatcherBehaviorChanged += API_StringMatcherBehaviorChanged;
+
             static void WatchProgramUpdate()
             {
                 Win32.WatchProgramUpdate(_settings);
                 _ = UWPPackage.WatchPackageChangeAsync();
             }
         }
 
+        private void API_StringMatcherBehaviorChanged(object sender, EventArgs e)
+        {
+            // Since cache stores the search results based on the old string matcher behavior,
+            // we need to reset the cache when the string matcher behavior changes
+            ResetCache();
+        }
+
         public static async Task IndexWin32ProgramsAsync(bool resetCache)
         {
             await _win32sLock.WaitAsync();
@@ -558,6 +567,7 @@ public async Task ReloadDataAsync()
 
         public void Dispose()
         {
+            Context.API.StringMatcherBehaviorChanged -= API_StringMatcherBehaviorChanged;
             Win32.Dispose();
         }
     }