Show ongoing operations in exit confirmation dialog

Also changes the button to a dangerous button, forcing user acknowledgement

osu.Game/Screens/Menu/ConfirmExitDialog.cs

@@ -2,25 +2,65 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using osu.Framework.Allocation;
 using osu.Framework.Graphics.Sprites;
+using osu.Game.Overlays;
 using osu.Game.Overlays.Dialog;
 
 namespace osu.Game.Screens.Menu
 {
     public partial class ConfirmExitDialog : PopupDialog
     {
+        private readonly Action onConfirm;
+        private readonly Action? onCancel;
+
         /// <summary>
         /// Construct a new exit confirmation dialog.
         /// </summary>
         /// <param name="onConfirm">An action to perform on confirmation.</param>
         /// <param name="onCancel">An optional action to perform on cancel.</param>
         public ConfirmExitDialog(Action onConfirm, Action? onCancel = null)
+        {
+            this.onConfirm = onConfirm;
+            this.onCancel = onCancel;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(INotificationOverlay notifications)
         {
             HeaderText = "Are you sure you want to exit osu!?";
-            BodyText = "Last chance to turn back";
 
             Icon = FontAwesome.Solid.ExclamationTriangle;
 
+            if (notifications.HasOngoingOperations)
+            {
+                string text = "There are currently some background operations which will be aborted if you continue:\n\n";
+
+                foreach (var n in notifications.OngoingOperations)
+                    text += $"{n.Text} ({n.Progress:0%})\n";
+
+                text += "\nLast chance to turn back";
+
+                BodyText = text;
+
+                Buttons = new PopupDialogButton[]
+                {
+                    new PopupDialogDangerousButton
+                    {
+                        Text = @"Let me out!",
+                        Action = onConfirm
+                    },
+                    new PopupDialogCancelButton
+                    {
+                        Text = @"Cancel",
+                        Action = onCancel
+                    },
+                };
+            }
+            else
+            {
+                BodyText = "Last chance to turn back";
+
                 Buttons = new PopupDialogButton[]
                 {
                     new PopupDialogOkButton
@@ -36,4 +76,5 @@ namespace osu.Game.Screens.Menu
                 };
             }
         }
+    }
 }