add additional default commands listed in xubuntu's xflock4 #7
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This adds additional default commands, taken from the xflock4 version shipped by Ubuntu (which contains more command than xfce's version). Additionally, I've added physlock as a last-resort fallback.
In my testing the order seems to be relevant, since XUbuntu 22.04 ships with a xdg-screensaver version that doesn't support the lock option (you get an error message and exit code 4 instead), but it does support xfce4-screensaver-command.
Aside: xflock4 also first tries to find a lock command configured in xfconf, by calling
xfconf-query -c xfce4-session -p /general/LockCommand
. That doesn't neatly fit into what this library is doing so far, so I didn't add it here, but I think it's an interesting option to explore.