Multicombo with optgroups


I need to create a multicombo with optgroups. How can I do?

These 2 snippets were very useful:

I managed to put optgroups in multiselect, richselect, and combo. I could not make it in multicombo.
Alternative question: Instead of a suggest body, how to add an options treesuggest in a multicombo as it is possible in multiselect, richselect, and combo?

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