Move workaround to subscreen

osu.Game/Screens/Edit/Editor.cs

@@ -719,11 +719,7 @@ private void dimBackground()
 
         public override bool OnExiting(ScreenExitEvent e)
         {
-            // Before exiting, trigger a focus loss.
-            //
-            // This is important to ensure that if the user is still editing a textbox, it will commit
-            // (and potentially block the exit procedure for save).
-            GetContainingFocusManager().TriggerFocusContention(this);
+            currentScreen?.OnExiting(e);
 
             if (!ExitConfirmed)
             {

osu.Game/Screens/Edit/EditorScreen.cs

@@ -6,6 +6,7 @@
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
+using osu.Framework.Screens;
 
 namespace osu.Game.Screens.Edit
 {
@@ -37,6 +38,10 @@ protected EditorScreen(EditorScreenMode type)
 
         protected override void PopOut() => this.FadeOut();
 
+        public virtual void OnExiting(ScreenExitEvent e)
+        {
+        }
+
         #region Clipboard operations
 
         public BindableBool CanCut { get; } = new BindableBool();

osu.Game/Screens/Edit/Setup/SetupScreen.cs

@@ -5,6 +5,7 @@
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Screens;
 using osu.Game.Graphics.Containers;
 using osu.Game.Overlays;
 
@@ -55,6 +56,17 @@ private void load(EditorBeatmap beatmap, OverlayColourProvider colourProvider)
             }));
         }
 
+        public override void OnExiting(ScreenExitEvent e)
+        {
+            base.OnExiting(e);
+
+            // Before exiting, trigger a focus loss.
+            //
+            // This is important to ensure that if the user is still editing a textbox, it will commit
+            // (and potentially block the exit procedure for save).
+            GetContainingFocusManager().TriggerFocusContention(this);
+        }
+
         private partial class SetupScreenSectionsContainer : SectionsContainer<SetupSection>
         {
             protected override UserTrackingScrollContainer CreateScrollContainer()