The icon fallbacks were links an activation script made (and tracked in
~/.local/state/steam-frame-nix/icon-fallbacks) after scanning the desktop
entries. They are Home Manager links now:
~/.local/share/icons/hicolor/scalable/apps/<name>.svg -> the largest Breeze
app SVG, for utilities-terminal and preferences-system (SteamOS' Konsole and
KDE System Settings) plus iconFallbacks.extra; a name Breeze doesn't have
fails the build. enable = false: none.
- The scan is read-only now (steam-frame-icon-fallbacks --suggest): each
switch prints icons Steam can't find that Breeze has (for extra) and
fallbacks hicolor has anyway.
- hicolor's mtime is bumped when the set of links changed between
generations, so a running Steam rescans (GTK checks theme dir mtimes).
- The script's old links at those paths are removed before
checkLinkTargets (they would be collisions); any others and the manifest
go through steam-frame-nix-cleanup.
The assertion for the old list form stays until ~2026-12.
Document the patch calling convention once in lib/default.nix; patch
headers say what, target, hook, state and contracts. Comments only, no
code changes.
Pierre Kisters