Restore editor clock time after difficulty switch

osu.Game/Screens/Edit/EditorState.cs

@@ -0,0 +1,19 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable enable
+
+namespace osu.Game.Screens.Edit
+{
+    /// <summary>
+    /// Structure used to transport data between <see cref="Editor"/> instances on difficulty change.
+    /// It's intended to be received by <see cref="EditorLoader"/> from one editor instance and passed down to the next one.
+    /// </summary>
+    public class EditorState
+    {
+        /// <summary>
+        /// The current clock time when a difficulty switch was requested.
+        /// </summary>
+        public double? Time { get; set; }
+    }
+}