[FileExplorer-Add-ons][SVG] Preprocess svg thumbnail before previewing (#18685)

* [FileExplorer-Add-ons][SVG Thumbnail] Preprocess svg thumbnail before previewing

same logic is usedas for preview handler

* Fix build

src/modules/previewpane/SvgPreviewHandler/SvgPreviewControl.cs

@@ -12,7 +12,6 @@ using System.Windows.Forms;
 using Common;
 using Common.Utilities;
 using Microsoft.PowerToys.PreviewHandler.Svg.Telemetry.Events;
-using Microsoft.PowerToys.PreviewHandler.Svg.Utilities;
 using Microsoft.PowerToys.Telemetry;
 using Microsoft.Web.WebView2.Core;
 using Microsoft.Web.WebView2.WinForms;

src/modules/previewpane/SvgThumbnailProvider/SvgThumbnailProvider.cs

@@ -252,6 +252,13 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
                 using (var reader = new StreamReader(stream))
                 {
                     svgData = reader.ReadToEnd();
+                    try
+                    {
+                        svgData = SvgPreviewHandlerHelper.AddStyleSVG(svgData);
+                    }
+                    catch (Exception)
+                    {
+                    }
                 }
             }
 

src/modules/previewpane/UnitTests-SvgPreviewHandler/SvgPreviewHandlerHelperTests.cs

@@ -3,7 +3,7 @@
 // See the LICENSE file in the project root for more information.
 
 using System.Text;
-using Microsoft.PowerToys.PreviewHandler.Svg.Utilities;
+using Common.Utilities;
 using Microsoft.PowerToys.STATestExtension;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 

src/modules/previewpane/common/Utilities/SvgPreviewHandlerHelper.cs

@@ -4,11 +4,10 @@
 
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.Linq;
 using System.Xml.Linq;
 
-namespace Microsoft.PowerToys.PreviewHandler.Svg.Utilities
+namespace Common.Utilities
 {
     /// <summary>
     /// Helper utilities for Svg Preview Handler.