prompt user restart required when blur theme is selected first time

Author: jjw24

Flow.Launcher.Core/Resource/Theme.cs

@@ -30,6 +30,10 @@ public class Theme
 
         public bool BlurEnabled { get; set; }
 
+        // due to blur only enabled when main window is loaded for the first time, this is used to track the blur status
+        // when the window is first loaded and prompt user that a restart is required for blur to take effect. 
+        public bool BlurEnabledOnloaded { get; set; }
+
         public Theme()
         {
             _themeDirectories.Add(DirectoryPath);

Flow.Launcher/Languages/en.xaml

@@ -39,6 +39,8 @@
     <system:String x:Key="querySearchPrecision">Query Search Precision</system:String>
     <system:String x:Key="ShouldUsePinyin">Should Use Pinyin</system:String>
     <system:String x:Key="ShouldUsePinyinToolTip">Allows using Pinyin to search. Pinyin is the standard system of romanized spelling for transliterating Chinese</system:String>
+    <system:String x:Key="shadowEffectNotAllowed">Shadow effect is not allowed while current theme has blur effect enabled</system:String>
+    <system:String x:Key="blurEffectRequireRestart">Current theme has blur effect enabled for the first time, a restart is required in order to take effect</system:String>
 
     <!--Setting Plugin-->
     <system:String x:Key="plugin">Plugin</system:String>

Flow.Launcher/MainWindow.xaml.cs

@@ -64,6 +64,8 @@ private void OnLoaded(object sender, RoutedEventArgs _)
             // currently blur can only be called when loading main window. 
             // is there a way to set blur only once?
             ThemeManager.Instance.SetBlurForWindow();
+            ThemeManager.Instance.BlurEnabledOnloaded = ThemeManager.Instance.BlurEnabled;
+
             WindowsInteropHelper.DisableControlBox(this);
             InitProgressbarAnimation();
             InitializePosition();

Flow.Launcher/ViewModel/SettingWindowViewModel.cs

@@ -275,6 +275,11 @@ public string SelectedTheme
                 if (ThemeManager.Instance.BlurEnabled && Settings.UseDropShadowEffect)
                     DropShadowEffect = false;
 
+                if (!ThemeManager.Instance.BlurEnabledOnloaded && ThemeManager.Instance.BlurEnabled)
+                {
+                    MessageBox.Show(InternationalizationManager.Instance.GetTranslation("blurEffectRequireRestart"));
+                    ThemeManager.Instance.BlurEnabledOnloaded = true;
+                }
             }
         }
 
@@ -288,7 +293,7 @@ public bool DropShadowEffect
             {
                 if (ThemeManager.Instance.BlurEnabled && value)
                 {
-                    MessageBox.Show(InternationalizationManager.Instance.GetTranslation("pleaseSelectAnItem"));
+                    MessageBox.Show(InternationalizationManager.Instance.GetTranslation("shadowEffectNotAllowed"));
                     return;
                 }