D6709: config: add --registered flag to show all known configs

[marmoute (Pierre-Yves David)]

marmoute added a comment.


  We will need more than just matching the categoie name to detect experimental/deprecated config. There are such option outside of the `experimental` section, and we still need to hide them by default. You can grep for `# experimental config:` to see some example.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6709/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6709

To: navaneeth.suresh, #hg-reviewers, av6, marmoute
Cc: mharbison72, yuja, pulkit, marmoute, av6, mjpieters, mercurial-devel