[tab(buffer)line] How to make new buffer (say, on :e) "tab" (item) appear near current, and not at the end?

[msva]

Hi there!
I've just migrated from barbar to custom hand-made tabline crafted with heirline, but can't reproduce barbar's feature of placing (say, when you open new file with :e or through other things like Neo-Tree/Telescope/documentation/whatever) item representing the new buffer right after currently active one.

As for now, everytime I open new file, it's item appears at the end of the list (although, btw, closing that buffers returns back to the previously active buffer).

Advice me, please, how can I make it (I assume utils.make_buflist()) to add new-buffer items near "previosly active" one?

I thinnking of playing with buf_func and cache (4 and 5 arguments of the function), but I totally out of ideas, how to implement such insertton logic 🤷