betterselect_taxonomy_form_term_from_checkboxes() is a strange one. Where is it supposed to be used? I can see it's being attached to the submit handler for the taxonomy_form_term form, but why? I don't see the element being used on the Taxonomy form.
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Comment #1
Mark Theunissen commentedAhh, that's because I had "only on node form" selected. But there is still a bug I think, the hook_form_alter() should not add a submit handler if the 'betterselect_node_form_only' variable is set.
Fixed in -dev.