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Codeman/.changeset/xterm6-selection-background.md
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Codeman maintainer 9acc5aad50 fix(terminal): name the selection colour the way xterm 6 does
Every per-skin xterm palette declared its selection layer as `selection`,
the key xterm.js renamed to `selectionBackground` in v5. An ITheme is a
plain object handed straight to the terminal, so an unknown key is not an
error, it is dropped: all seven skins have been drawing xterm's built-in
default, rgba(255,255,255,0.3), rather than the colour sitting next to it
in the palette.

Nobody saw it on the dark skins, where white at 30% is close to what those
palettes asked for. On the four light skins it is white over a near-white
background: blended, Paper Gray's selection differs from its own background
by 3/255. That is not a subtle highlight, it is no highlight, and it looks
exactly like a selection gesture that failed, which is part of what #360
reports on Android Chrome.

test/skin-themes.test.ts pins both halves: the key name, and that the
blended selection stays at least 16/255 from the background on every skin,
plus the light-skin fallback landing under that floor, which is what makes
this a fix rather than a rename.

Refs #360

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-09-14 23:33:36 +02:00

756 B

aicodeman
aicodeman
patch

Fix an invisible terminal text selection on the light skins (#360). Every xterm palette declared its selection colour under the key selection, which xterm.js renamed to selectionBackground in v5. An ITheme is a plain object, so the unknown key was dropped without an error and every skin fell back to xterm's own default of rgba(255,255,255,0.3): unnoticeable on the dark skins, which wanted roughly that anyway, and effectively invisible on Paper Gray, Solarized Light, Catppuccin Latte and Rosé Pine Dawn, where white at 30% over a near-white background moves a channel by about 3/255. Selecting text on those skins now highlights it, with desktop drag-select and the mobile long-press both fixed by the same rename.