Deleting a Let block from context menu adds two undo steps

[cdsmith]

Add a let block, and a use of it.

If you drag the block to the trash can, then undo, it works as expected. But if you right-click the block and delete it from the context menu, then two separate actions are added to undo history: first, removal of existing uses, and second, deleting the block. To recover the program, you need to undo twice.