Use macOS template icons

This PR changes the macOS TrayIcon to use template icons that change automatically based on the darkness of the desktop background.

Also updates AvaloniaUI to latest version.

This fixes #6021

Duplicati/GUI/Duplicati.GUI.TrayIcon/AvaloniaRunner.cs

@@ -61,25 +61,25 @@ namespace Duplicati.GUI.TrayIcon
 
         internal Task RunOnUIThread(Action action)
         {
-          if (_disposed != 0)
-              return Task.CompletedTask;
+            if (_disposed != 0)
+                return Task.CompletedTask;
 
-          return actionDelayer.ExecuteAction(() =>
-            {
-                try
-                {
-                    if (_disposed != 0 )
-                    {
-                        return;
-                    }
-                    RunOnUIThreadInternal(action);
-                }
-                catch (Exception ex)
-                {
-                    Log.WriteErrorMessage(LOGTAG, "AvaloniaRunOnUIThreadFailed", ex, "Failed to run action on UI thread");
-                    throw;
-                }
-            });
+            return actionDelayer.ExecuteAction(() =>
+              {
+                  try
+                  {
+                      if (_disposed != 0)
+                      {
+                          return;
+                      }
+                      RunOnUIThreadInternal(action);
+                  }
+                  catch (Exception ex)
+                  {
+                      Log.WriteErrorMessage(LOGTAG, "AvaloniaRunOnUIThreadFailed", ex, "Failed to run action on UI thread");
+                      throw;
+                  }
+              });
         }
 
         private void RunOnUIThreadInternal(Action action)
@@ -89,7 +89,7 @@ namespace Duplicati.GUI.TrayIcon
                 return;
 
             if (_disposed != 0)
-                return ;
+                return;
 
             if (Dispatcher.UIThread.CheckAccess())
                 action();
@@ -340,7 +340,7 @@ namespace Duplicati.GUI.TrayIcon
         private void UpdateIcon()
         {
             if (nativeMenuItem == null)
-                    return;
+                return;
 
             nativeMenuItem.Icon = this.Icon switch
             {
@@ -410,6 +410,7 @@ namespace Duplicati.GUI.TrayIcon
             if (this.trayIcon == null)
                 return;
 
+            MacOSProperties.SetIsTemplateIcon(this.trayIcon, true);
             switch (icon)
             {
                 case TrayIcons.IdleError:
@@ -482,7 +483,7 @@ namespace Duplicati.GUI.TrayIcon
             }
             catch (Exception ex)
             {
-                 Console.WriteLine($"AVALALONIA desktop.Shutdown() failed because of {ex}");
+                Console.WriteLine($"AVALALONIA desktop.Shutdown() failed because of {ex}");
             }
 
         }

Duplicati/GUI/Duplicati.GUI.TrayIcon/Duplicati.GUI.TrayIcon.csproj

@@ -21,11 +21,11 @@
     <TrimmableAssembly Include="Avalonia.Themes.Default" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="11.2.0" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.2.0" />
-    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.0" />
+    <PackageReference Include="Avalonia" Version="11.3.2" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.2" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.2" />
     <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
-    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.2.0" />
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.3.2" />
   </ItemGroup>
   <ItemGroup>
     <AvaloniaResource Include="Assets\**" />