[GUI] selecting multipage

[white_haired_uncle]

Currently, I'm doing this:

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dialog.unit_info_mp:add_item_of_type("empty_page")
dialog.unit_info_mp:add_item_of_type("unit_info_page")
...
dialog.unit_info_mp[2].unit_info_preview.unit = wesnoth.units.find{ id = unit.id }[1]
dialog.unit_info_mp.selected_index = 2

I'd like to be doing this:

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empty_item, empty_pos = dialog.unit_info_mp:add_item_of_type("empty_page")
unit_item, unit_pos = dialog.unit_info_mp:add_item_of_type("unit_info_page")
...
unit_item.unit_info_preview.unit = wesnoth.units.find{ id = unit.id }[1]
dialog.unit_info_mp.selected_index = unit_pos

However, I believe add_item_of_type is currently broken, always returning -1 for pos.

https://github.com/wesnoth/wesnoth/issues/8490

Is there an alternative to selected_index that uses item instead of position, or can I somehow get the (real) position from item, for example:

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dialog.unit_info_mp.selected_item = item

or

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dialog.unit_info_mp.selected_index = item.pos

I don't think those examples make a lot of sense, but hopefully they convey what I'm trying to accomplish.

It's really not a big deal either way, I'm just trying to break a bad habit before it takes hold.