* Print: list driverless CUPS destinations, not only permanent queues
The Print dialog's printer list came from `lpstat -p -d`, which lists only
permanent queues. A driverless IPP printer discovered on the network — the
standard setup on modern Linux desktops — has no permanent queue: only
`lpstat -e` (CUPS >= 1.7) names it, and CUPS builds a temporary queue when
`lp` sends it a job. Until now such printers were invisible and the dialog
showed only Save as PDF.
Enumerate `lpstat -e` alongside `lpstat -p -d` and merge the answers: queues
first, deduplicated, default still from `-d`; a spooler without `-e` keeps
today's behaviour and loses only the driverless names. The .deb/.rpm now
recommend cups-client so a machine without a print stack is not silently
printerless.
Fixes#652
Co-authored-by: ZCode (GLM-5.3) <noreply@z.ai>
* Print: fix the off-unix build and a driverless default's marker
`lpstat_e_command` is called only from `printers`' unix block, so off unix
it was dead code and CI's Windows clippy gate (`-D warnings`) failed to
build the crate. Gate it like its caller.
The default destination can itself be driverless — `lpoptions -d` names a
destination no queue exists for — and the merge appended it from
`lpstat -e` with `default: false`, so the dialog preselected the first
queue instead of the user's default. The `-d` default now marks the
appended entry too; the test covers it, and CRLF in `-e` output.
Co-authored-by: ZCode (GLM-5.3) <noreply@z.ai>
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Co-authored-by: ZCode (GLM-5.3) <noreply@z.ai>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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