Files, Papers, Loupe and every other libadwaita application read their
accent from the Settings portal, so they rendered in GNOME blue no
matter which accent this desktop was set to -- correct on our own
surfaces, wrong on half the screen.
xdg-desktop-portal-gtk cannot serve org.freedesktop.appearance
accent-color at all; the string does not appear in the 1.15.3 binary.
The gnome backend serves it, so Settings now routes to gnome with gtk
still listed behind it -- the frontend merges Settings backends in
order, so color-scheme keeps resolving if the gnome backend is ever
unavailable.
GNOME's accent-color is a fixed enum of nine names rather than a color,
so each of our eight accents carries its nearest member. Nearest by hue
rather than by name: rose maps to red, because it is the red role in
this palette.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
