enable multi-window

[ilkosta]

Problem related to the request

Sometimes I have to integrate two notebooks at the same time that even if they deal with different topics can have intersections that I want to manage.

the solution you'd like

It would be convenient for me to be able to have a vnote window open with a notebook and another window that points to another notebook.

When I reopen vnote I would like to find the same configuration used in the last session (same number of windows pointing to the same notebooks)

Describe alternatives you've considered
I don't know if starting multiple vnode instances is a safe solution

thanks for any suggestions