kc3-lang/libxkbcommon

2025-08-16T12:59:20

compose: Add fallback for custom locales Before this commit, loading a Compose file based on the locale would fail if the locale is not in the X11 Compose locale registry. While there are workarounds (e.g. `~/.XCompose` file or `$XCOMPOSEFILE`), it does not work if the corresponding file has `include "%L"`. This commit adds the fallback `en_US.UTF-8` in case the locale is installed but not registered in the X11 Compose locale registry. The choice is motivated by the fact that most locales use `en_US.UTF-8` anyway. Ideally we should have a mechanism to extend the Compose locale registry at the *system* level. Mechanisms at the user level (e.g. custom Compose file, environment variable) are deemed sufficient. We could still improve it by first trying to fallback to the locale without the country bits, but there is no function to do such function in the stdlib and we do not want to mess with locales manually. Unfortunately is not possible to test it in our test suite. One can still check it works following these instructions: 1. Create a custom locale, e.g. `en_XX.UTF-8`. `glibc-i18ndata` or similar package may be required to get the required files in `/usr/share/i18n/`. `sudo localedef -i en_US -f UTF-8 en_XX.UTF-8` 2. `xkbcli compile-compose --verbose --locale en_XX.UTF-8`