[FileExplorerPreview] Move everything from WebBrowser to WebView2 (#17588)

* Move MarkdownPreviewHandler from WebBrowser to WebView2

* Disable context menu
Open links in default browser

* Update expect.txt

* Move SvgPreviewHandler from WebBrowser to WebView2

* Migrate SvgThumbnailProvider from WebBrowser to WebView2

* Migrate CustomControlTest to WebView2
Remove WebBrowser related stuff

* Update tests

* Revert GetThumbnail return value
Disable javascript dialogs in WebView2 for Svg thumbnail and preview

* expect.txt

* Increase timeout for Markdown tests

* Add sleeps

* Add zero check

src/modules/previewpane/common/examplehandler/CustomControlTest.cs

@@ -3,7 +3,12 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.IO;
+using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Windows.Forms;
+using Microsoft.Web.WebView2.Core;
+using Microsoft.Web.WebView2.WinForms;
 
 namespace Common
 {
@@ -12,6 +17,38 @@ namespace Common
     /// </summary>
     public class CustomControlTest : FormHandlerControl
     {
+        /// <summary>
+        /// WebView2 Control to display Svg.
+        /// </summary>
+        private WebView2 _browser;
+
+        /// <summary>
+        /// WebView2 Environment
+        /// </summary>
+        private CoreWebView2Environment _webView2Environment;
+
+        /// <summary>
+        /// Name of the virtual host
+        /// </summary>
+        public const string VirtualHostName = "PowerToysLocalCustomControlTest";
+
+        /// <summary>
+        /// Gets the path of the current assembly.
+        /// </summary>
+        /// <remarks>
+        /// Source: https://stackoverflow.com/a/283917/14774889
+        /// </remarks>
+        public static string AssemblyDirectory
+        {
+            get
+            {
+                string codeBase = Assembly.GetExecutingAssembly().Location;
+                UriBuilder uri = new UriBuilder(codeBase);
+                string path = Uri.UnescapeDataString(uri.Path);
+                return Path.GetDirectoryName(path);
+            }
+        }
+
         /// <summary>
         /// Start the preview on the Control.
         /// </summary>
@@ -21,13 +58,41 @@ namespace Common
             this.InvokeOnControlThread(() =>
             {
                 var filePath = dataSource as string;
-                WebBrowser browser = new WebBrowser();
 
-                browser.DocumentText = "Test";
-                browser.Navigate(new Uri(filePath));
-                browser.Dock = DockStyle.Fill;
-                browser.IsWebBrowserContextMenuEnabled = false;
-                this.Controls.Add(browser);
+                _browser = new WebView2();
+                _browser.Dock = DockStyle.Fill;
+                _browser.Visible = true;
+                _browser.NavigationCompleted += (object sender, CoreWebView2NavigationCompletedEventArgs args) =>
+                {
+                    // Put here logic needed after WebView2 control is done navigating to url/page
+                };
+
+                ConfiguredTaskAwaitable<CoreWebView2Environment>.ConfiguredTaskAwaiter
+                   webView2EnvironmentAwaiter = CoreWebView2Environment
+                       .CreateAsync(userDataFolder: System.Environment.GetEnvironmentVariable("USERPROFILE") +
+                                                    "\\AppData\\LocalLow\\Microsoft\\PowerToys\\CustomControlTest-Temp")
+                       .ConfigureAwait(true).GetAwaiter();
+                webView2EnvironmentAwaiter.OnCompleted(async () =>
+                {
+                    try
+                    {
+                        _webView2Environment = webView2EnvironmentAwaiter.GetResult();
+                        await _browser.EnsureCoreWebView2Async(_webView2Environment).ConfigureAwait(true);
+                        await _browser.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync("window.addEventListener('contextmenu', window => {window.preventDefault();});");
+                        _browser.CoreWebView2.SetVirtualHostNameToFolderMapping(VirtualHostName, AssemblyDirectory, CoreWebView2HostResourceAccessKind.Allow);
+
+                        // Navigate to page represented as a string
+                        _browser.NavigateToString("Test");
+
+                        // Or navigate to Uri
+                        _browser.Source = new Uri(filePath);
+                    }
+                    catch (NullReferenceException)
+                    {
+                    }
+                });
+
+                this.Controls.Add(_browser);
                 base.DoPreview(dataSource);
             });
         }