Unfortunately it's not quite enough for S20xprint to be lexically later
that S20cupsys. It can take cupsd a few seconds to build up its list of
remote printers, and on fast machines we often see Xprt start before
that task is complete; users then complain about missing printers in
Mozilla's list.

A workaround is to "/etc/init.d/xprint restart" some time later, but
that brings its own problems (see bug #304026, fixed post-sarge).

More fundamentally, CUPS printers can both appear and disappear during
normal system operation; this is especially true of remote printers
detected by IPP's browsing mechanism. To cope with this situation,
Xprt ought to refresh its printer list automatically from time to time.


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