Following the discussion at #10852, I believe this is the right default.
I'm willing to continue to revisit this decisions, but Ghostty 1.3 is
around the corner and I don't think such a change like this should be
pushed into it.
I think palette generation is best left as a _theme author_ tool. A
Ghostty color theme could include `palette-generate=true` if it wants
to customize the 256-color palette more easily. Of course, end users can
as well anytime.
Another part of my reasoning is that TUI programs who want this behavior
can already achieve it themselves by mixing dark/light theme detection
via CSI 996 (https://contour-terminal.org/vt-extensions/color-palette-update-notifications/)
with OSC 4/10/11 color query and change sequences, both of which are
decently supported in the terminal ecosystem and fully supported in
Ghostty.
I'm also open to considering some kind of new sequence to make this
easier for TUIs (probably a mode) where they can opt-in to palette
generation plus "harmonius" palettes (see `palette-harmonius`) and
Ghostty does it on demand then. I think that'd solve the legacy vs new
TUI argument where legacy programs can continue to make assumptions
about the palette and new programs can opt-in to a more dynamic palette
without having to do a lot of work themselves.
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