bug#63290: 30.0.50; Customize UI shows extra fields for (choice (const ...) (alist ...))

[Thomas Fitzsimmons]

Mauro Aranda <maurooaranda@gmail.com> writes:

> Thomas Fitzsimmons <fitzsim@fitzsim.org> writes: 

[...] 

> > It seems like after a const is shown, Customize considers the 
> > variable "edited".  I don't know why it is adding those extra 
> > INS/DEL key/value UI boxes though. 
>
> The code currently ignores the value if it's present but 
> nil. That's not good, obviously.  But it might be tricky to fix 
> it because other widgets depend on the code ignoring it... 
>
> I think it might be good to have a different property specify a 
> default value (defaulting to :value upon creation, if not 
> provided), and let :value be treated as of today, like the 
> current value holder. 

OK, thanks for taking a look; let me know if you want me to try a 
patch.  Sounds like a good way of maintaining backward 
compatibility with respect to other widgets.

Or you can test it against excorporate-configuration in GNU ELPA; 
just search for the FIXME that mentions this bug report.

Thanks,
Thomas