Refactor mod panel selection logic to avoid overwriting

osu.Game/Overlays/Mods/ModPanel.cs

@@ -37,8 +37,6 @@ namespace osu.Game.Overlays.Mods
                 Shear = new Vector2(-ShearedOverlayContainer.SHEAR, 0),
                 Scale = new Vector2(HEIGHT / ModSwitchSmall.DEFAULT_SIZE)
             };
-
-            Action = select;
         }
 
         public ModPanel(Mod mod)
@@ -59,19 +57,17 @@ namespace osu.Game.Overlays.Mods
             Filtered.BindValueChanged(_ => updateFilterState(), true);
         }
 
-        private void select()
+        protected override void Select()
-        {
-            if (!Active.Value)
         {
             modState.RequiresConfiguration = Mod.RequiresConfiguration;
             Active.Value = true;
         }
-            else
+
+        protected override void Deselect()
         {
             modState.RequiresConfiguration = false;
             Active.Value = false;
         }
-        }
 
         #region Filtering support
 

osu.Game/Overlays/Mods/ModPresetPanel.cs

@@ -37,8 +37,6 @@ namespace osu.Game.Overlays.Mods
 
             Title = preset.Value.Name;
             Description = preset.Value.Description;
-
-            Action = toggleRequestedByUser;
         }
 
         [BackgroundDependencyLoader]
@@ -54,15 +52,19 @@ namespace osu.Game.Overlays.Mods
             selectedMods.BindValueChanged(_ => selectedModsChanged(), true);
         }
 
-        private void toggleRequestedByUser()
+        protected override void Select()
+        {
+            // if the preset is not active at the point of the user click, then set the mods using the preset directly, discarding any previous selections,
+            // which will also have the side effect of activating the preset (see `updateActiveState()`).
+            selectedMods.Value = Preset.Value.Mods.ToArray();
+        }
+
+        protected override void Deselect()
         {
-            // if the preset is not active at the point of the user click, then set the mods using the preset directly, discarding any previous selections.
             // if the preset is active when the user has clicked it, then it means that the set of active mods is exactly equal to the set of mods in the preset
             // (there are no other active mods than what the preset specifies, and the mod settings match exactly).
             // therefore it's safe to just clear selected mods, since it will have the effect of toggling the preset off.
-            selectedMods.Value = !Active.Value
+            selectedMods.Value = Array.Empty<Mod>();
-                ? Preset.Value.Mods.ToArray()
-                : Array.Empty<Mod>();
         }
 
         private void selectedModsChanged()

osu.Game/Overlays/Mods/ModSelectPanel.cs

@@ -143,9 +143,25 @@ namespace osu.Game.Overlays.Mods
                 }
             };
 
-            Action = () => Active.Toggle();
+            Action = () =>
+            {
+                if (!Active.Value)
+                    Select();
+                else
+                    Deselect();
+            };
         }
 
+        /// <summary>
+        /// Performs all actions necessary to select this <see cref="ModSelectPanel"/>.
+        /// </summary>
+        protected abstract void Select();
+
+        /// <summary>
+        /// Performs all actions necessary to deselect this <see cref="ModSelectPanel"/>.
+        /// </summary>
+        protected abstract void Deselect();
+
         [BackgroundDependencyLoader]
         private void load(AudioManager audio, ISamplePlaybackDisabler? samplePlaybackDisabler)
         {