Follow theme change

Author: Jack251970

Flow.Launcher/ReleaseNotesWindow.xaml

@@ -11,6 +11,7 @@
     Title="{DynamicResource releaseNotes}"
     Width="700"
     Background="{DynamicResource PopuBGColor}"
+    Closed="Window_Closed"
     Foreground="{DynamicResource PopupTextColor}"
     Loaded="Window_Loaded"
     ResizeMode="CanResize"

Flow.Launcher/ReleaseNotesWindow.xaml.cs

@@ -8,6 +8,7 @@
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Input;
+using System.Windows.Media;
 using Flow.Launcher.Infrastructure.Http;
 using MdXaml;
 
@@ -18,13 +19,15 @@ public partial class ReleaseNotesWindow : Window
         public ReleaseNotesWindow()
         {
             InitializeComponent();
+            ModernWpf.ThemeManager.Current.ActualApplicationThemeChanged += ThemeManager_ActualApplicationThemeChanged;
         }
 
         #region Window Events
 
         private void Window_Loaded(object sender, RoutedEventArgs e)
         {
             RefreshMaximizeRestoreButton();
+            ThemeManager_ActualApplicationThemeChanged(null, null);
         }
 
         private void OnCloseExecuted(object sender, ExecutedRoutedEventArgs e)
@@ -182,5 +185,27 @@ private async void RefreshMarkdownViewer()
                 }
             });
         }
+
+        private void Window_Closed(object sender, EventArgs e)
+        {
+            ModernWpf.ThemeManager.Current.ActualApplicationThemeChanged -= ThemeManager_ActualApplicationThemeChanged;
+        }
+
+        private void ThemeManager_ActualApplicationThemeChanged(ModernWpf.ThemeManager sender, object args)
+        {
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                if (ModernWpf.ThemeManager.Current.ActualApplicationTheme == ModernWpf.ApplicationTheme.Light)
+                {
+                    MarkdownViewer.Foreground = Brushes.Black;
+                    MarkdownViewer.Background = Brushes.White;
+                }
+                else
+                {
+                    MarkdownViewer.Foreground = Brushes.White;
+                    MarkdownViewer.Background = Brushes.Black;
+                }
+            });
+        }
     }
 }