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.
Previously files would be pasted as only the filename. This commit
introduces an extension to NSPasteboard which provides a method to
consistently get the string contents of a pasteboard so that the
behavior can stay the same anywhere where we need to do that.
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.
Fixes#1500
This overhauls how we do focus management for surfaces to make it more
robust. This DID somehow all work before but was always brittle and was
a sketchy play with SwiftUI/AppKit behavior across macOS versions.
The new approach uses our window controller and terminal delegate
system to disseminate focus information whenever any surface changes
focus. This ensures that only ONE surface ever has focus in libghostty
because the controller ensures it is widely distributed.
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).
It uses a private compositing filter to match what the sytem does to
color unselected tabs in the window's tab bar (specifically with a
light appearance).
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.
FAR from a perfect fix, as the background seen through the tabs during window drags will be behind by a frame or so still, but definitely a vast improvement over not updating at all.
