[Octave-bug-tracker] [bug #31583] pre-register available backends

[John W. Eaton]

Follow-up Comment #1, bug #31583 (project octave):

Currently, registering a backend as "available" requires creating an instance
of the backend.  Do we really want to require that just to list the possible
graphics backends?  If so, then it is probably a fairly simple change, but if
not, it looks like there is some work to do to disentangle the idea of
announcing that a backend is present from the act of creating a backed
object.

Also, I'm not sure that "available_backend" and "backend" is the best
terminology.  We should probably be referring to "graphics_renderer", or
"graphics_toolkit" or something similar instead of just "backend", which
doesn't indicate at all that it has anything to do with graphics.

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