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feat(desktop): dark-mode Qt/GTK apps via portal color-scheme

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Qt apps (keepassxc, pinentry-qt) rendered light while the GTK side was
Adwaita-dark. keepassxc's `auto` theme reads dark/light only from the
xdg-desktop-portal `color-scheme` value, which the gtk portal serves from
dconf `org/gnome/desktop/interface/color-scheme` — unset, so it reported
"no preference" and fell back to light. Set it to `prefer-dark`.

Also route Qt through the `gtk3` platform theme (`libqgtk3` ships in
qtbase, unlike an external `adwaita-qt` style plugin which nixpkgs' baked
`QT_PLUGIN_PATH` makes unreachable), and set the GTK prefer-dark flag.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Daniel Fainberg
2026-07-07 16:26:38 +02:00
parent 5172ca4d18
commit b2fabbc764
1 changed files with 25 additions and 0 deletions
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@@ -323,6 +323,31 @@ in
# Keep the GTK2 rc out of $HOME (default ~/.gtkrc-2.0). Setting this also
# makes home-manager export GTK2_RC_FILES so GTK2 apps still find it.
gtk2.configLocation = "${config.xdg.configHome}/gtk-2.0/gtkrc";
# The theme *name* alone isn't enough: the qgtk3 Qt bridge and apps' dark
# detection (e.g. keepassxc's "auto" theme) read this flag, not the name.
# Set it so both GTK apps and the Qt-via-gtk3 apps resolve to dark.
gtk3.extraConfig.gtk-application-prefer-dark-theme = true;
gtk4.extraConfig.gtk-application-prefer-dark-theme = true;
};
# The canonical dark/light signal on Wayland: apps query the xdg-desktop-portal
# Settings interface for org.freedesktop.appearance/color-scheme over D-Bus, and
# the gtk portal serves that from this dconf key. keepassxc's "auto" theme reads
# it (NixUtils::isDarkMode) and ignores the GTK theme name / Qt style entirely,
# so without this the portal reports 0 ("no preference") and keepass stays light.
# prefer-dark makes the portal report dark to every color-scheme-aware app.
dconf.settings."org/gnome/desktop/interface".color-scheme = "prefer-dark";
# Match the Qt apps (keepassxc, pinentry-qt, ssh askpass) to the GTK
# Adwaita-dark above, else they render the default light Fusion style. Use the
# gtk3 platform theme, not an adwaita *style* override: nixpkgs wraps Qt apps
# with a baked QT_PLUGIN_PATH pointing only at their build deps, so an external
# style plugin (adwaita-qt) is unreachable and QT_STYLE_OVERRIDE is silently
# ignored. The gtk3 plugin (libqgtk3) ships inside qtbase itself, so it's
# always on that path, and it reads the GTK theme (Adwaita-dark) directly.
qt = {
enable = true;
platformTheme.name = "gtk3";
};
# The home-manager Hyprland module below enables xdg.portal and pins the