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Terminal background: decide 24-bit color like tcell, and log why

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The check only looked at COLORTERM, but tcell also draws 24-bit color for
terminals whose description has it (xterm-ghostty, xterm-kitty), so in
Ghostty on macOS without COLORTERM the background was never used. Use
tcell's rules, and always log which background is used and why.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW
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nils
2026-10-21 11:53:47 +02:00
co-authored by Claude Opus 5.5
parent 0270462fe4
commit d2e868293f
5 changed files with 48 additions and 18 deletions
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CHANGELOG.md
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@@ -5,7 +5,8 @@
- **The terminal's own background:** the panes used color 0 of the terminal's palette ("black"),
which many color themes set to a grey lighter than their background (e.g. Catppuccin), so the
whole program looked washed out and grey text almost disappeared. The terminal is now asked for
its background color at startup and that is used (with 24-bit color and a dark background).
its background color at startup and that is used (with 24-bit color and a dark background). The
Log says which background is used and why.
- **Smooth scrolling on huge terminals:** while an arrow key is held, the poster waits until the
selection rests (120 ms). Every poster rewrites all of its cells, which on a terminal zoomed far
out was more output per step than the terminal could draw, so moving through a list lagged.