Multiple windows opened at same time

[wilk85]

TLDR
Right now we can open only one window at a time in factorio, for example inventory, or combinators gui

What?
More windows can be open at a time


Why?
it will be easier to operate with multiple windows be open at one time, and player can choose which one to open/close
For example that would be helpfull in base/other management, or combinators debugging

Where can it be found?
Openttd has this option in game