Use a different exit value when foot itself fails to run
Foot, and footclient, will exit with the client application's (i.e. the shell's) exit value.
This allows one to e.g. script things like
But, it makes it impossible to tell when foot itself failed to run (due to running outside a Wayland session, no fonts installed, invalid shell/client application etc).
Use a different exit value, or even better, different exit values, for this.
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