Support of tab pages

[rocket-engineer]

Hi folke,

first of all thx a lot for this awesome plugin! This was on my plugin todo list for quite a while (I liked the idea from ldelossa/nvim-ide). Now, you realized it - perfect!

I'm a friend of tab pages. I tried edgy with multiple tab pages and apparently, the window layout is present only in the first tab page. If I want to toggle a view in the second tab page, the respective view in first tab page is closed. Is this the expected behavior?

Is it possible to add support for tab pages? I guess you have to store the views then in multiple tables (one for every tab page). Also, if a new tab page is created, it would be awesome to mirror the window layout of the current tab page.