Fixes#9952Fixes#9969
This fixes our `constrainToScreen` implementation to properly clamp the
window size to the visible screen its coming on as documented. Further,
this addresses the positioning problem, too.
Fixes#2660
Rather than calculate our window frame size based on various chrome
calculations, we now utilize SwiftUI layouts and view intrinsic content
sizes with `setContentSize` to setup our content size ignoring all our
other widgets.
I'm sure there's some edge cases I'm missing here but this should be a
whole lot more reliable on the whole.
This fixes an issue where pressing the red close button in a window or
the "x" button on a tab couldn't differentiate and would always close
the tab or close the window (depending on tab counts).
It seems like in both cases, AppKit triggers the `windowShouldClose`
delegate method on the controller, but for the close window case it
triggers this on ALL the windows in the group, not just the one
that was clicked.
I implemented a kind of silly coordinator that debounces
`windowShouldClose` calls over 100ms and uses that to differentiate
between the two cases.
