Port SelectedPathEditor (#2305)

Closes #2282

src/System.Design/src/System.Design.Forwards.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -11,6 +11,7 @@
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.ListViewGroupCollectionEditor))]
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.ListViewItemCollectionEditor))]
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.ListViewSubItemCollectionEditor))]
+[assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.SelectedPathEditor))]
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.StringArrayEditor))]
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.StringCollectionEditor))]
 [assembly: TypeForwardedTo(typeof(System.Windows.Forms.Design.TabPageCollectionEditor))]

src/System.Windows.Forms.Design.Editors/src/Resources/SR.resx

@@ -198,4 +198,7 @@ Press Ctrl+Enter to accept Text.</value>
   <data name="iconFileDescription" xml:space="preserve">
     <value>Icon files</value>
   </data>
+  <data name="SelectedPathEditorLabel" xml:space="preserve">
+    <value>Select the path to the folder that will initially be selected in the FolderBrowserDialog.</value>
+  </data>
 </root>

src/System.Windows.Forms.Design.Editors/src/System/Windows/Forms/Design/FolderNameEditor.cs

@@ -95,7 +95,7 @@ public string Description
             public unsafe DialogResult ShowDialog(IWin32Window owner)
             {
                 // Get/find an owner HWND for this dialog
-                IntPtr hWndOwner = owner == null ? owner.Handle : UnsafeNativeMethods.GetActiveWindow();
+                IntPtr hWndOwner = owner != null ? owner.Handle : UnsafeNativeMethods.GetActiveWindow();
 
                 // Get the IDL for the specific startLocation
                 Shell32.SHGetSpecialFolderLocation(hWndOwner, (int)StartLocation, out CoTaskMemSafeHandle listHandle);

src/System.Windows.Forms.Design.Editors/src/System/Windows/Forms/Design/SelectedPathEditor.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Windows.Forms.Design
+{
+    /// <summary>
+    ///  Folder editor for choosing the initial folder of the folder browser dialog.
+    /// </summary>
+    internal class SelectedPathEditor : FolderNameEditor
+    {
+        protected override void InitializeDialog(FolderBrowser folderBrowser)
+        {
+            folderBrowser.Description = SR.SelectedPathEditorLabel;
+        }
+    }
+}

src/System.Windows.Forms.Design.Editors/tests/UnitTests/EnsureEditorsTests.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
@@ -78,7 +78,7 @@ public void EnsureUITypeEditorForType(Type type, Type expectedEditorType)
         [InlineData(typeof(DateTimePicker), "Value", typeof(DateTimeEditor))]
         [InlineData(typeof(DomainUpDown), "Items", typeof(StringCollectionEditor))]
         //[InlineData(typeof(ErrorProvider), "DataMember", typeof(DataMemberListEditor))]
-        //[InlineData(typeof(FolderBrowserDialog), "SelectedPath", typeof(SelectedPathEditor))]
+        [InlineData(typeof(FolderBrowserDialog), "SelectedPath", typeof(SelectedPathEditor))]
         //[InlineData(typeof(HelpProvider), "HelpNamespace", typeof(HelpNamespaceEditor))]
         [InlineData(typeof(Label), "ImageIndex", typeof(ImageIndexEditor))]
         [InlineData(typeof(Label), "ImageKey", typeof(ImageIndexEditor))]