Add ability to send selected skin components to front or back

osu.Game/Overlays/SkinEditor/SkinEditor.cs

@@ -556,11 +556,46 @@ namespace osu.Game.Overlays.SkinEditor
             changeHandler?.BeginChange();
 
             foreach (var item in items)
-                availableTargets.FirstOrDefault(t => t.Components.Contains(item))?.Remove(item);
+                availableTargets.FirstOrDefault(t => t.Components.Contains(item))?.Remove(item, true);
 
             changeHandler?.EndChange();
         }
 
+        public void BringSelectionToFront()
+        {
+            if (getTarget(selectedTarget.Value) is not SkinComponentsContainer target)
+                return;
+
+            // Iterating by target components order ensures we maintain the same order across selected components, regardless
+            // of the order they were selected in.
+            foreach (var d in target.Components.ToArray())
+            {
+                if (!SelectedComponents.Contains(d))
+                    continue;
+
+                target.Remove(d, false);
+
+                // Selection would be reset by the remove.
+                SelectedComponents.Add(d);
+                target.Add(d);
+            }
+        }
+
+        public void SendSelectionToBack()
+        {
+            if (getTarget(selectedTarget.Value) is not SkinComponentsContainer target)
+                return;
+
+            foreach (var d in target.Components.ToArray())
+            {
+                if (SelectedComponents.Contains(d))
+                    continue;
+
+                target.Remove(d, false);
+                target.Add(d);
+            }
+        }
+
         #region Drag & drop import handling
 
         public Task Import(params string[] paths)

osu.Game/Overlays/SkinEditor/SkinSelectionHandler.cs

@@ -13,6 +13,7 @@ using osu.Framework.Utils;
 using osu.Game.Extensions;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Rulesets.Edit;
+using osu.Game.Screens.Edit.Components.Menus;
 using osu.Game.Screens.Edit.Compose.Components;
 using osu.Game.Skinning;
 using osuTK;
@@ -206,6 +207,14 @@ namespace osu.Game.Overlays.SkinEditor
                     ((Drawable)blueprint.Item).Position = Vector2.Zero;
             });
 
+            yield return new EditorMenuItemSpacer();
+
+            yield return new OsuMenuItem("Bring to front", MenuItemType.Standard, () => skinEditor.BringSelectionToFront());
+
+            yield return new OsuMenuItem("Send to back", MenuItemType.Standard, () => skinEditor.SendSelectionToBack());
+
+            yield return new EditorMenuItemSpacer();
+
             foreach (var item in base.GetContextMenuItemsForSelection(selection))
                 yield return item;
 

osu.Game/Skinning/ISerialisableDrawableContainer.cs

@@ -45,6 +45,7 @@ namespace osu.Game.Skinning
         /// Remove an existing skinnable component from this target.
         /// </summary>
         /// <param name="component">The component to remove.</param>
-        void Remove(ISerialisableDrawable component);
+        /// <param name="disposeImmediately">Whether removed items should be immediately disposed.</param>
+        void Remove(ISerialisableDrawable component, bool disposeImmediately);
     }
 }

osu.Game/Skinning/SkinComponentsContainer.cs

@@ -100,7 +100,7 @@ namespace osu.Game.Skinning
         /// <inheritdoc cref="ISerialisableDrawableContainer"/>
         /// <exception cref="NotSupportedException">Thrown when attempting to add an element to a target which is not supported by the current skin.</exception>
         /// <exception cref="ArgumentException">Thrown if the provided instance is not a <see cref="Drawable"/>.</exception>
-        public void Remove(ISerialisableDrawable component)
+        public void Remove(ISerialisableDrawable component, bool disposeImmediately)
         {
             if (content == null)
                 throw new NotSupportedException("Attempting to remove a new component from a target container which is not supported by the current skin.");
@@ -108,7 +108,7 @@ namespace osu.Game.Skinning
             if (!(component is Drawable drawable))
                 throw new ArgumentException($"Provided argument must be of type {nameof(Drawable)}.", nameof(component));
 
-            content.Remove(drawable, true);
+            content.Remove(drawable, disposeImmediately);
             components.Remove(component);
         }