Add per plugin theme override

src/DesktopMagic/Helpers/SettingElementGenerator.cs

@@ -206,7 +206,8 @@ internal class SettingElementGenerator(ComboBox optionsComboBox)
             {
                 try
                 {
-                    eComboBox.Value = comboBox.SelectedItem.ToString() ?? string.Empty;
+                    comboBox.SelectedItem ??= eComboBox.Value;
+                    eComboBox.Value = comboBox.SelectedItem?.ToString() ?? eComboBox.Value;
                 }
                 catch (Exception ex)
                 {

src/DesktopMagic/Plugins/PluginWindow.xaml.cs

@@ -1,6 +1,7 @@
 using DesktopMagic.Api;
 using DesktopMagic.Api.Drawing;
 using DesktopMagic.Api.Settings;
+using DesktopMagic.DataContexts;
 using DesktopMagic.Helpers;
 using DesktopMagic.Plugins;
 using DesktopMagic.Settings;
@@ -250,9 +251,15 @@ public partial class PluginWindow : Window
         {
             SetHorizontalAlignment();
             SetVerticalAlignment();
+            SetThemeOverride();
+            SetThemeOverrideItems();
 
             pluginClassInstance.horizontalAlignment.OnValueChanged += SetHorizontalAlignment;
             pluginClassInstance.verticalAlignment.OnValueChanged += SetVerticalAlignment;
+            pluginClassInstance.themeOverride.OnValueChanged += SetThemeOverride;
+
+            DesktopMagicSettings desktopMagicSettings = MainWindowDataContext.GetSettings();
+            desktopMagicSettings.Themes.CollectionChanged += (s, e) => SetThemeOverrideItems();
         });
 
         void SetVerticalAlignment()
@@ -282,6 +289,31 @@ public partial class PluginWindow : Window
             viewBox.HorizontalAlignment = horizontalAlignment;
             border.HorizontalAlignment = horizontalAlignment;
         }
+
+        void SetThemeOverride()
+        {
+            if (pluginClassInstance.themeOverride.Value == "<None>")
+            {
+                settings.CurrentThemeName = null;
+            }
+            else
+            {
+                settings.CurrentThemeName = pluginClassInstance.themeOverride.Value;
+            }
+        }
+
+        void SetThemeOverrideItems()
+        {
+            DesktopMagicSettings desktopMagicSettings = MainWindowDataContext.GetSettings();
+
+            pluginClassInstance.themeOverride.Items.Clear();
+            pluginClassInstance.themeOverride.Items.Add("<None>");
+
+            foreach (Theme theme in desktopMagicSettings.Themes)
+            {
+                pluginClassInstance.themeOverride.Items.Add(theme.Name);
+            }
+        }
     }
 
     private void LoadOptions(object instance)

src/DesktopMagicPluginAPI/Plugin.cs

@@ -17,6 +17,9 @@ public abstract class Plugin
     [Setting("desktopmagic-vertical-alignment", "Vertical Alignment", -998)]
     internal ComboBox verticalAlignment = new ComboBox("Center", "Top", "Bottom");
 
+    [Setting("theme-override", "Theme Override", -997)]
+    internal ComboBox themeOverride = new ComboBox("<None>");
+
     private IPluginData application = null!;
 
     /// <summary>