Make `force-show` debug option useful
WLR_BACKENDS=x11 GSETTINGS_BACKEND=memory phoc -C ../phosh/data/phoc.ini -E phosh-osk-stub
wasn't very useful as we'd also have to set
gsettings set org.gnome.desktop.a11y.applications screen-keyboard-enabled true
so make
POS_DEBUG=force-show WLR_BACKENDS=x11 GSETTINGS_BACKEND=memory phoc -C ../phosh/data/phoc.ini -E phosh-osk-stub
override this. While at that fix being aborted by the compositor if we don't have any layouts defined.