deselect items that go into mags, allow partial moves when all items are the same and stackable

Patches/MultiSelectPatches.cs

@@ -478,6 +478,9 @@ namespace UIFixes
                 DisableMerge = targetItem == null;
                 bool isGridPlacement = targetItem == null;
 
+                // If everything selected is the same type and is a stackable type, allow partial success
+                bool allowPartialSuccess = targetItem != null && itemContext.Item is GClass2735 && MultiSelect.ItemContexts.All(ic => ic.Item.TemplateId == itemContext.Item.TemplateId);
+
                 Stack<GStruct413> operations = new();
                 foreach (ItemContextClass selectedItemContext in MultiSelect.SortedItemContexts(itemContext))
                 {
@@ -583,6 +586,11 @@ namespace UIFixes
 
                 DisableMerge = false;
 
+                if (allowPartialSuccess && operations.Any())
+                {
+                    __result = true;
+                }
+
                 if (!__result)
                 {
                     HidePreviews();