Finishes #378
Supercedes #4159
This adds a new enum value for `macos-non-native-fullscreen`:
`padded-notch`. This value will add padding to the top of the window to
account for the notch on applicable devices while still hiding the
menu.
This value is preferred over "visible-menu" by some people because for
screens without a notch, the window will take up the full height.
The plan in the future is that we may color the padded area when a notch
is present. In this commit it appears as transparent.
Fixes#5328
The dock sits above the level of the quick terminal, and the quick
terminal frame typical includes the dock. Hence, if the dock is visible
and the quick terminal would conflict with it, then part of the terminal
is obscured.
This commit makes the dock autohide if the quick terminal would conflict
with it. The autohide is disabled when the quick terminal is closed.
We can't set our window level above the dock, as this would prevent
things such as input methods from rendering properly in the quick
terminal window.
iTerm2 (the only other macOS terminal I know of that supports a dropdown
mode) frames the terminal around the dock. I think this looks less
aesthetically pleasing and I prefer autohiding the dock instead.
We can introduce a setting to change this behavior if desired later.
Additionally, this commit introduces a mechanism to safely set
app-global presentation options from multiple sources without stepping
on each other.
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.