Revert "[File Explorer Add-ons] Fix file preview pane flickering on f… (#27093)

* Revert "[File Explorer Add-ons] Fix file preview pane flickering on file selection and resizing (#26660)"

This reverts commit 9581cd7a27.

* Revert "[Build][FileExplorer]Add missing dwmapi.lib to Debug config (#26940)"

This reverts commit d190934d61.

* Revert "[Build]Fix dwamapi.lib linking error on VS (#26870)"

This reverts commit c7f8b696a6.

src/modules/previewpane/MonacoPreviewHandler/MonacoPreviewHandlerControl.cs

@@ -77,11 +77,6 @@ namespace Microsoft.PowerToys.PreviewHandler.Monaco
         /// </summary>
         private string _base64FileCode;
 
-        public MonacoPreviewHandlerControl()
-        {
-            this.SetBackground();
-        }
-
         [STAThread]
         public override void DoPreview<T>(T dataSource)
         {
@@ -100,12 +95,14 @@ namespace Microsoft.PowerToys.PreviewHandler.Monaco
 
             base.DoPreview(dataSource);
 
+            // Sets background color
+            SetBackground();
+
             // Starts loading screen
             InitializeLoadingScreen();
 
             // New webview2 element
             _webView = new WebView2();
-            _webView.DefaultBackgroundColor = Color.Transparent;
 
             // Checks if dataSource is a string
             if (!(dataSource is string filePath))

src/modules/previewpane/MonacoPreviewHandler/Settings.cs

@@ -86,7 +86,7 @@ namespace Microsoft.PowerToys.PreviewHandler.Monaco
             {
                 if (GetTheme() == "dark")
                 {
-                    return Color.FromArgb(30, 30, 30); // #1e1e1e
+                    return System.Drawing.ColorTranslator.FromHtml("#1e1e1e");
                 }
                 else
                 {