Don't snap to global grid while placing grid

osu.Game.Rulesets.Osu/Edit/Blueprints/GridPlacementBlueprint.cs

@@ -70,6 +70,8 @@ protected override bool OnMouseDown(MouseDownEvent e)
             return base.OnMouseDown(e);
         }
 
+        public override SnapType SnapType => ~SnapType.GlobalGrids;
+
         public override void UpdateTimeAndPosition(SnapResult result)
         {
             var pos = ToLocalSpace(result.ScreenSpacePosition);

osu.Game/Rulesets/Edit/PlacementBlueprint.cs

@@ -71,6 +71,8 @@ public virtual void EndPlacement(bool commit)
             PlacementActive = PlacementState.Finished;
         }
 
+        public virtual SnapType SnapType => SnapType.All;
+
         /// <summary>
         /// Updates the time and position of this <see cref="PlacementBlueprint"/> based on the provided snap information.
         /// </summary>

osu.Game/Screens/Edit/Compose/Components/ComposeBlueprintContainer.cs

@@ -297,7 +297,7 @@ private void refreshTool()
 
         private void updatePlacementPosition()
         {
-            var snapResult = Composer.FindSnappedPositionAndTime(InputManager.CurrentState.Mouse.Position);
+            var snapResult = Composer.FindSnappedPositionAndTime(InputManager.CurrentState.Mouse.Position, CurrentPlacement.SnapType);
 
             // if no time was found from positional snapping, we should still quantize to the beat.
             snapResult.Time ??= Beatmap.SnapTime(EditorClock.CurrentTime, null);