Wayland compositors take a window's icon from the desktop entry named by its app ID; the .deb,
.rpm and Flatpak install it, an AppImage installs nothing, so its window got the generic icon.
Started from an AppImage ($APPIMAGE), the app now writes a hidden (NoDisplay) desktop entry
pointing at it, and its 256 px icon, under $XDG_DATA_HOME (~/.local/share) before the window
opens. Nothing is written when an installed package or the user's own entry provides the ID;
the entry follows the AppImage when it moves; failures are only logged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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