Revert "Revert "[File Explorer Add-ons] Fix file preview pane flickering on f… (#27093)" (#27122)

This reverts commit 217f3f9ff3.

src/modules/previewpane/SvgPreviewHandler/Settings.cs

@@ -47,7 +47,7 @@ namespace SvgPreviewHandler
             {
                 if (Common.UI.ThemeManager.GetWindowsBaseColor().ToLowerInvariant() == "dark")
                 {
-                    return ColorTranslator.FromHtml("#1e1e1e");
+                    return Color.FromArgb(30, 30, 30); // #1e1e1e
                 }
                 else
                 {

src/modules/previewpane/SvgPreviewHandler/SvgPreviewControl.cs

@@ -20,6 +20,11 @@ namespace Microsoft.PowerToys.PreviewHandler.Svg
     /// </summary>
     public class SvgPreviewControl : FormHandlerControl
     {
+        /// <summary>
+        /// Settings class
+        /// </summary>
+        private readonly SvgPreviewHandler.Settings _settings = new();
+
         /// <summary>
         /// Generator for the actual preview file
         /// </summary>
@@ -78,6 +83,11 @@ namespace Microsoft.PowerToys.PreviewHandler.Svg
         private string _webView2UserDataFolder = System.Environment.GetEnvironmentVariable("USERPROFILE") +
                                 "\\AppData\\LocalLow\\Microsoft\\PowerToys\\SvgPreview-Temp";
 
+        public SvgPreviewControl()
+        {
+            this.SetBackgroundColor(_settings.ThemeColor);
+        }
+
         /// <summary>
         /// Start the preview on the Control.
         /// </summary>
@@ -199,6 +209,7 @@ namespace Microsoft.PowerToys.PreviewHandler.Svg
         private void AddWebViewControl(string svgData)
         {
             _browser = new WebView2();
+            _browser.DefaultBackgroundColor = Color.Transparent;
             _browser.Dock = DockStyle.Fill;
 
             // Prevent new windows from being opened.