No longer shows success message if content moving is cancelled (#15051)

* Fix for issue https://github.com/umbraco/Umbraco-CMS/issues/13923
 - Added AttemptMove method to the ContentService
 - Updated ContentController PostMove method to return ValidationProblem whenever the node is not moved

* Align changes with V14 solution. Make it non breaking.

---------

Co-authored-by: Laura Neto <12862535+lauraneto@users.noreply.github.com>

src/Umbraco.Core/Services/ContentService.cs

@@ -2448,22 +2448,26 @@ public class ContentService : RepositoryService, IContentService
     /// <param name="content">The <see cref="IContent" /> to move</param>
     /// <param name="parentId">Id of the Content's new Parent</param>
     /// <param name="userId">Optional Id of the User moving the Content</param>
-    public void Move(IContent content, int parentId, int userId = Constants.Security.SuperUserId)
+    public void Move(IContent content, int parentId, int userId = Constants.Security.SuperUserId) =>
+        AttemptMove(content, parentId, userId);
+
+    /// <inheritdoc/>
+    [Obsolete("Adds return type to Move method. Will be removed in V14, as the original method will be adjusted.")]
+    public OperationResult AttemptMove(IContent content, int parentId, int userId = Constants.Security.SuperUserId)
     {
+        EventMessages eventMessages = EventMessagesFactory.Get();
+
         if (content.ParentId == parentId)
         {
-            return;
+            return OperationResult.Succeed(eventMessages);
         }
 
         // if moving to the recycle bin then use the proper method
         if (parentId == Constants.System.RecycleBinContent)
         {
-            MoveToRecycleBin(content, userId);
-            return;
+            return MoveToRecycleBin(content, userId);
         }
 
-        EventMessages eventMessages = EventMessagesFactory.Get();
-
         var moves = new List<(IContent, string)>();
 
         using (ICoreScope scope = ScopeProvider.CreateCoreScope())
@@ -2482,7 +2486,7 @@ public class ContentService : RepositoryService, IContentService
             if (scope.Notifications.PublishCancelable(movingNotification))
             {
                 scope.Complete();
-                return; // causes rollback
+                return OperationResult.Cancel(eventMessages);// causes rollback
             }
 
             // if content was trashed, and since we're not moving to the recycle bin,
@@ -2517,6 +2521,8 @@ public class ContentService : RepositoryService, IContentService
 
             scope.Complete();
         }
+
+        return OperationResult.Succeed(eventMessages);
     }
 
     // MUST be called from within WriteLock

src/Umbraco.Core/Services/IContentService.cs

@@ -1,3 +1,4 @@
+using Umbraco.Cms.Core.Events;
 using Umbraco.Cms.Core.Models;
 using Umbraco.Cms.Core.Models.Membership;
 using Umbraco.Cms.Core.Persistence.Querying;
@@ -315,6 +316,21 @@ public interface IContentService : IContentServiceBase<IContent>
     /// </summary>
     void Move(IContent content, int parentId, int userId = Constants.Security.SuperUserId);
 
+    /// <summary>
+    /// Attempts to move the <see cref="IContent"/> <paramref name="content"/> to under the node with id <paramref name="parentId"/>.
+    /// </summary>
+    /// <param name="content">The <see cref="IContent"/> that shall be moved.</param>
+    /// <param name="parentId">The id of the new parent node.</param>
+    /// <param name="userId">Id of the user attempting to move <paramref name="content"/>.</param>
+    /// <returns>Success if moving succeeded, otherwise Failed.</returns>
+    [Obsolete("Adds return type to Move method. Will be removed in V14, as the original method will be adjusted.")]
+    OperationResult
+        AttemptMove(IContent content, int parentId, int userId = Constants.Security.SuperUserId)
+    {
+        Move(content, parentId, userId);
+        return OperationResult.Succeed(new EventMessages());
+    }
+
     /// <summary>
     ///     Copies a document.
     /// </summary>

src/Umbraco.Web.BackOffice/Controllers/ContentController.cs

@@ -2254,7 +2254,12 @@ public class ContentController : ContentControllerBase
             return null;
         }
 
-        _contentService.Move(toMove, move.ParentId, _backofficeSecurityAccessor.BackOfficeSecurity?.GetUserId().Result ?? -1);
+        OperationResult moveResult = _contentService.AttemptMove(toMove, move.ParentId, _backofficeSecurityAccessor.BackOfficeSecurity?.GetUserId().Result ?? -1);
+
+        if (!moveResult.Success)
+        {
+            return ValidationProblem();
+        }
 
         return Content(toMove.Path, MediaTypeNames.Text.Plain, Encoding.UTF8);
     }