Feature idea: BYO virtual display for hiding windows

[jaybonthius]

Aerospace currently uses the bottom corners of each display to hide windows. As the documentation points out, this method imposes limitations on monitor configurations. Many popular setups, such as triple-screen and tie-fighter arrangements, are incompatible with Aerospace.

It's possible to create virtual displays that exist only in memory. In fact, the popular application BetterDisplay recently added a feature to manage virtual displays.

I propose an Aerospace feature that would allow users to specify a virtual display to use as a "free space" for hiding windows. This would accommodate any monitor configuration the user desires. To keep Aerospace as lightweight as possible, this could be implemented as bring-your-own-virtual-display—users could then use whichever virtual display management app they prefer and simply tell Aerospace which display to use for hiding.

Checklist

• [X] I've searched for duplicates. My search queries were (please don't forget to search in closed issues too):
  • virtual display
  • virtual
  • betterdisplay
• [X] I've read the guide https://nikitabobko.github.io/AeroSpace/guide
• [X] I've searched in the documentation (https://nikitabobko.github.io/AeroSpace/guide & https://nikitabobko.github.io/AeroSpace/commands). My search queries were:
  • virtual display
  • virtual

[nikitabobko]

I had this idea in my mind. It won't work because:

1. If monitors have different resolutions, it will be a performance disaster #149
2. Some apps may not like to be often moved between monitors (like chrome: #289)
3. If AeroSpace crashes, users will loose windows on the invisible monitor
4. I don't like providing config options for choosing between different trade-offs
5. To my taste, a "virtual monitor" hack is just intuitively too much invasive to be reliable, there might be other problems