7ba8fc1768
When an object uses linked mesh data and the object and the modifier node group are made local after versioning runs for the first time, a new modifier is added every time the file is opened. An obvious fix is to check whether there is already a modifier with the versioning node group. In that case we can skip the object. This doesn't fully fix the scenario from #120030; it requires that the node group is made local so it doesn't leave a reference to a non-existent library data-block.
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