Fix "reveal background" triggering in one more case it shouldn't

Closes https://github.com/ppy/osu/issues/34393 again. Hopefully for the
last time.

osu.Game/Graphics/Carousel/Carousel.cs

@@ -71,6 +71,11 @@ namespace osu.Game.Graphics.Carousel
         /// </summary>
         public bool IsFiltering => !filterTask.IsCompleted;
 
+        /// <summary>
+        /// Whether absolute scrolling is currently triggered.
+        /// </summary>
+        public bool AbsoluteScrolling => Scroll.AbsoluteScrolling;
+
         /// <summary>
         /// The number of times filter operations have been triggered.
         /// </summary>

osu.Game/Graphics/Carousel/Carousel_ScrollContainer.cs

@@ -120,9 +120,12 @@ namespace osu.Game.Graphics.Carousel
 
             #region Absolute scrolling
 
-            private bool absoluteScrolling;
+            /// <summary>
+            /// Whether absolute scrolling is currently triggered.
+            /// </summary>
+            public bool AbsoluteScrolling { get; private set; }
 
-            protected override bool IsDragging => base.IsDragging || absoluteScrolling;
+            protected override bool IsDragging => base.IsDragging || AbsoluteScrolling;
 
             public bool OnPressed(KeyBindingPressEvent<GlobalAction> e)
             {
@@ -169,7 +172,7 @@ namespace osu.Game.Graphics.Carousel
 
             protected override bool OnMouseMove(MouseMoveEvent e)
             {
-                if (absoluteScrolling)
+                if (AbsoluteScrolling)
                 {
                     ScrollToAbsolutePosition(e.CurrentState.Mouse.Position);
                     return true;
@@ -181,10 +184,10 @@ namespace osu.Game.Graphics.Carousel
             private void beginAbsoluteScrolling(UIEvent e)
             {
                 ScrollToAbsolutePosition(e.CurrentState.Mouse.Position);
-                absoluteScrolling = true;
+                AbsoluteScrolling = true;
             }
 
-            private void endAbsoluteScrolling() => absoluteScrolling = false;
+            private void endAbsoluteScrolling() => AbsoluteScrolling = false;
 
             #endregion
 

osu.Game/Screens/SelectV2/SongSelect.cs

@@ -849,7 +849,7 @@ namespace osu.Game.Screens.SelectV2
             // For simplicity, disable this functionality on mobile.
             bool isTouchInput = e.CurrentState.Mouse.LastSource is ISourcedFromTouch;
 
-            if (e.PressedButtons.SequenceEqual([MouseButton.Left]) && !isTouchInput && mouseDownPriority)
+            if (!carousel.AbsoluteScrolling && !isTouchInput && mouseDownPriority)
             {
                 revealingBackground = Scheduler.AddDelayed(() =>
                 {