Making sure macOS's "monitor focus" agrees with `focus-monitor` in the case of empty monitors

[ELLIOTTCABLE]

focus-monitor is great (Aerospace has really come a long way!); but at the moment, it's got one glaring flow issue.

When all monitors have at least one window, cycling through them with a focus-monitor left command or similar also drags the macOS "focus" along (that is, the top menubar is faded out on the other, non-focused displays; and ⌘␣ pops up a search window on the correct monitor.)

However, if there's a monitor with no windows on it, then when you focus-monitor onto that empty monitor, there's no integration with the system. (The wrong monitor's menubar is highlighted, ⌘␣ will open windows on the wrong monitor, etc.)

This is slightly worse when borders or similar is installed - now, the 'active window' indicator is no longer doubling as a "what display/container AeroSpace is going to operate on" indicator.

One janky fix, is to rewrite the default on-focused-monitor-changed = ['move-mouse monitor-lazy-center'] hook to also …

1. determine if there's any windows on the newly-focused monitor and
2. then, if not, execute a mouse-click to click on the desktop and activate that monitor from macOS's point of view.

Thus, I suppose, at least one potential "fix" for this might be to make that behaviour the default (hopefully a lot) faster than indirecting through a shell, especially when tabbing through monitors quickly.

Checklist

• [x] I've searched for duplicates. My search queries were (please don't forget to search in closed issues too):
  • focus-monitor empty
  • "focus-monitor"
• [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)

❯ aerospace --version         
aerospace CLI client version: 0.14.2-Beta 0cb8dbdfc5ee73b8cbc200f175f467ebead55201
AeroSpace.app server version: 0.14.2-Beta 0cb8dbdfc5ee73b8cbc200f175f467ebead55201

[ParisTheProgrammer]

However, if there's a monitor with no windows on it, then when you focus-monitor onto that empty monitor, there's no integration with the system. (The wrong monitor's menubar is highlighted, ⌘␣ will open windows on the wrong monitor, etc.)

This is also the case when using workspace x to focus on a particular monitor, however I don't have any issues with applications opening on the wrong monitor. I've tested using spotlight and raycast (which is what I daily drive) and those work as expected even when the menubar isn't highlighted correctly. I also tested using workspace x and also focus-monitor right with no applications on my secondary monitor and applications still open up on whatever monitor is focused in aerospace (ie. the asterisked workspace in the menubar)