e5c32844678e292a084d6d97eb2d4ba6affc217d
New recursive iteration over IDs in BKE_library_foreach_ID_link() was broken by the infamous nodetree case. We cannot really recusively call this function in that case, so better to deffer handling of non-datablock NodeTrees as if real IDs here. Also fixed initial ID not being stored as handled, in rare cases this could also lead to infinite looping. To be backported to 2.78a.
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