[neomutt-devel] Deprecation Warning

[Richard Russon]

This is advanced warning of the removal of some config variables.
This has been discussed, on GitHub:
    https://github.com/neomutt/neomutt/issues/596

The duplicate variables:

* Haven't been documented for years
* Are confusing
* Don't add any value to NeoMutt
* Add complexity to the code

The plan, with some approximate durations, is:

# Stage 1 - Informing (1 month)

The Changes Guide lists all the differences between Mutt and NeoMutt:
    https://www.neomutt.org/changes/

To do:

* Write a short guide to fixing your config files (with scripts)
  These will be installed with NeoMutt

* Create a "New to NeoMutt?" guide
  Link to it from everywhere possible.

* Blanket coverage of all forums alerting users to the change

# Stage 2 - Warning (2 month)

NeoMutt will work as usual.

This might happen in one of two ways:

* Verbosely - warn the user about every old variable name in their config
  Urge them to read the guide to fixing their config
  Wait for a keypress

* Quietly - After startup, display a error message urging the user to
  read the guide.
  No keypress required, so it won't interrupt the user.

# Stage 3 - Removal

NeoMutt will not accept the old config.

NeoMutt may, for a while, recognise the old options and tell the user to
read the upgrade guide.


Cheers,
    Rich / FlatCap
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