Fix partial color palette loading

Author: neon-nyan

CollapseLauncher/Classes/Extension/UIElementExtensions.ThemeExtensions.cs

@@ -35,7 +35,7 @@ public static void ChangeAccentColor(this FrameworkElement element, Color accent
             element.ReloadPageTheme();
         }
 
-        private static void ReloadPageTheme(this FrameworkElement page)
+        internal static void ReloadPageTheme(this FrameworkElement page)
         {
             ElementTheme theme = InnerLauncherConfig.CurrentAppTheme switch
                                  {

CollapseLauncher/Classes/RegionManagement/RegionManagement.cs

@@ -212,7 +212,11 @@ private async Task DownloadNonPluginBackgroundImage(string             backgroun
             if (isDownloaded)
             {
                 BackgroundImgChanger.ChangeBackground(imgFileInfo.FullName,
-                                                      () => IsFirstStartup = false,
+                                                      () =>
+                                                      {
+                                                          IsFirstStartup = false;
+                                                          this.ReloadPageTheme();
+                                                      },
                                                       false,
                                                       false,
                                                       true);
@@ -245,7 +249,11 @@ private async Task DownloadNonPluginBackgroundImage(string             backgroun
                               _ => BackgroundMediaUtility.GetDefaultRegionBackgroundPath()
                           };
             BackgroundImgChanger.ChangeBackground(tempImage,
-                                                  () => IsFirstStartup = false,
+                                                  () =>
+                                                  {
+                                                      IsFirstStartup = false;
+                                                      this.ReloadPageTheme();
+                                                  },
                                                   false,
                                                   false,
                                                   true);
@@ -256,7 +264,11 @@ private async Task DownloadNonPluginBackgroundImage(string             backgroun
                                                                        token))
             {
                 BackgroundImgChanger.ChangeBackground(imgFileInfo.FullName,
-                                                      () => IsFirstStartup = false,
+                                                      () =>
+                                                      {
+                                                          IsFirstStartup = false;
+                                                          this.ReloadPageTheme();
+                                                      },
                                                       false,
                                                       true,
                                                       true);

CollapseLauncher/XAMLs/MainApp/MainPage.Background.cs

@@ -1,3 +1,4 @@
+using CollapseLauncher.Extension;
 using CollapseLauncher.Helper.Background;
 using CollapseLauncher.Helper.Image;
 using CollapseLauncher.Helper.Metadata;
@@ -221,7 +222,11 @@ internal async Task ChangeBackgroundImageAsRegionAsync(bool ShowLoadingMsg = fal
 
         // If the custom per region is enabled, then execute below
         BackgroundImgChanger.ChangeBackground(gameLauncherApi.GameBackgroundImgLocal,
-                                              () => IsFirstStartup = false,
+                                              () =>
+                                              {
+                                                  IsFirstStartup = false;
+                                                  this.ReloadPageTheme();
+                                              },
                                               IsCustomBG || isUseCustomPerRegionBg,
                                               true,
                                               true);