Do not forcibly re-expand carousel groups on refilters if the user manually collapsed them

RFC. Closes https://github.com/ppy/osu/issues/35091.

osu.Game/Screens/SelectV2/BeatmapCarousel.cs

@@ -343,6 +343,12 @@ namespace osu.Game.Screens.SelectV2
             }
         }
 
+        /// <summary>
+        /// Tracks whether the user has manually requested to collapse an open group.
+        /// In this case, refilters should not forcibly expand groups until the user expands a group again themselves.
+        /// </summary>
+        private bool userCollapsedGroup;
+
         protected override void HandleItemActivated(CarouselItem item)
         {
             try
@@ -355,11 +361,19 @@ namespace osu.Game.Screens.SelectV2
                         {
                             setExpansionStateOfGroup(ExpandedGroup, false);
                             ExpandedGroup = null;
+                            userCollapsedGroup = true;
                             return;
                         }
 
                         setExpandedGroup(group);
 
+                        if (userCollapsedGroup)
+                        {
+                            if (grouping.BeatmapSetsGroupedTogether && CurrentGroupedBeatmap != null)
+                                setExpandedSet(new GroupedBeatmapSet(CurrentGroupedBeatmap.Group, CurrentGroupedBeatmap.Beatmap.BeatmapSet!));
+                            userCollapsedGroup = false;
+                        }
+
                         // If the active selection is within this group, it should get keyboard focus immediately.
                         if (CurrentSelectionItem?.IsVisible == true && CurrentSelection is GroupedBeatmap gb)
                             RequestSelection(gb);
@@ -398,6 +412,9 @@ namespace osu.Game.Screens.SelectV2
                     throw new InvalidOperationException("Groups should never become selected");
 
                 case GroupedBeatmap groupedBeatmap:
+                    if (userCollapsedGroup)
+                        break;
+
                     setExpandedGroup(groupedBeatmap.Group);
 
                     if (grouping.BeatmapSetsGroupedTogether)