Don't silently do nothing when trying to rename to a duplicate name
Paint, when renaming a sprite via alt-clicking on the name, would silently do nothing if the target name already exists. This was different behaviour to renaming via the menu (which gives "Sprite name already exists") and the Filer (which gives "Filename already exists". Now, alt-click-rename also gives a suitable error. Version 2.14. Tagged as 'Paint-2_14'
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