Option to change split direction from verticle to horizontal on file open?

[MelonFunction]

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[sum01]

I guess a public function could be made (so it can be used from the API) as to allow it to open horizontally.

Something like try_open_at_cursor_horizontal or whatever. Then perhaps adding a bool to the params of try_open_at_y that internally tells it whether it should use VSplitIndex or HSplitIndex here