Fixes#2850
In native fullscreen, the titlebar container is no longer part of our
NSWindow and is instead a separate window called
NSToolbarFullScreenWindow. We now search for this window when we are in
native fullscreen.
Fixes#1833
This is an attempt to simplify the logic that has organically grown
convoluted over time with regards to how the titlebar and tab bar is
styled.
This field is one unified field that ONLY addresses titlebar and tab bar
styling. It can be one of "native", "transparent", or "tabs". The
"native" field is the new behavior in this commit: it makes the titlebar
and tab bar appearance be absolutely native. We do not color anything
(if we do its a bug).
The "transparent" option is the previous `macos-titlebar-tabs = false`
setting where the titlebar/tab bar is native but colored according to
the window background color.
The "tabs" option is `macos-titlebar-tabs = true`.
The `window-theme = auto` affect on titlebar appearance has been
removed. Now, the titlebar will NEVER be styled with "native" and MAY be
styled with "transparent" and will ALWAYS be styled with "tabs" (since
that's a totally custom look anyways).
We allow titlebarFont to be nil to differentiate between "system" (nil)
and "custom" (non-nil) behavior. For the "system" case, we need to use
the system _titlebar_ font (rather than just the default system font),
to match the system's conventions.
Add support for configurable fonts for window and tab titles. This is
only implemented for macOS (and could be macOS-only if other platforms
aren't able to support this using their windowing toolkits). It plays
nicely with regular and titlebar tabs.
To do this I forced a toolbar, so that we would have a place to put the
button when no tabs were opened. I also took the opportunity to make the
standard title/tab bar meld better with the terminal's background color,
just as we do with titlebar tabs.
This enables the standard effect created by a sytem tab bar, which
ensures unselected tabs blend with the window's/titlebar's background
color. This also ensures the `windowButtonsBackdrop` view matches the
color of the adjacent tab (be it selected or not).
In a light appearance there was a shadow cast on top of the inactive
tabs that looked bad. In a dark appearance the shadow manifests as a
solid line that required a faux border to look right. This removes both
and improves the aesthetics of the tab bar in light themes.
