Merge branch 'master' into spectator-replay-watcher

osu.Game/Rulesets/Edit/SelectionBlueprint.cs

@@ -120,6 +120,11 @@ namespace osu.Game.Rulesets.Edit
         /// </summary>
         public void Deselect() => State = SelectionState.NotSelected;
 
+        /// <summary>
+        /// Toggles the selection state of this <see cref="OverlaySelectionBlueprint"/>.
+        /// </summary>
+        public void ToggleSelection() => State = IsSelected ? SelectionState.NotSelected : SelectionState.Selected;
+
         public bool IsSelected => State == SelectionState.Selected;
 
         /// <summary>

osu.Game/Rulesets/UI/FrameStabilityContainer.cs

@@ -255,14 +255,13 @@ namespace osu.Game.Rulesets.UI
             NotValid,
 
             /// <summary>
-            /// Whether we are running up-to-date with our parent clock.
-            /// If not, we will need to keep processing children until we catch up.
+            /// Playback is running behind real-time. Catch-up will be attempted by processing more than once per
+            /// game loop (limited to a sane maximum to avoid frame drops).
             /// </summary>
             RequiresCatchUp,
 
             /// <summary>
-            /// Whether we are in a valid state (ie. should we keep processing children frames).
-            /// This should be set to false when the replay is, for instance, waiting for future frames to arrive.
+            /// In a valid state, progressing one child hierarchy loop per game loop.
             /// </summary>
             Valid
         }

osu.Game/Rulesets/UI/HitObjectContainer.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Performance;
 using osu.Game.Rulesets.Objects.Drawables;
 
 namespace osu.Game.Rulesets.UI