Fixes#2516
Those changes mean that when we have one ghostty window in non-native
fullscreen and another ghostty window not in fullscreen switching to not
fullscreen window won't cause appearing menu bar and dock. I think it
looks good:
If we implement detection and make menu bar and dock appear for not
fullscreen window in this case it will cause the fullscreen window to
change its size and will look bad.
Non-native fullscreen works bad with multiple screens in either way.
E.g. switching to a non-native fullscreen window would cause menubar
disappering on another screen or switching to not fullscreen window
would show menu bar over fullscreen window on another screen. I think
nobody would want non-native fullscreen with multiple screens.
Fixes#2840
Related to #2842
This builds on #2842 by missing a key situation: when native fullscreen
is toggled using the menu bar items it doesn't go through our
`FullscreenStyle` machinery so we don't trigger fullscreen change
events.
This commit makes it so that our FullscreenStyle always listens for
native fullscreen change (even in non-native modes) to fire a fullscreen
did change event. This way we can always rely on the event to be fired
when fullscreen changes no matter what.
Fixes#2370
Comparing NSScreens directly was fragile. It appears that AppKit/Cocoa
can return different instances of NSScreen for the same screen for
unknown reasons between calls to windowDidChangeScreen. I don't fully
understand why this happens.
In any case, our comparison was not safe. Instad, we now keep track of
of the CGDirectDisplayID for each screen and compare those instead.
