[neomutt-devel] Header Cache changes

[Richard Russon]

Hi all,

If you've been building NeoMutt from `main` recently, I urge you to:

- Rebuild from the current commit, aa6c6b346
- Delete your header cache

The header cache is very sensitive to code changes and there have been
quite a few recently.

Some recent upgrades converted `struct Address` to use `struct Buffer`,
which makes string manipulation a little easier (thanks navi!)

Unfortunately, the default caching of `struct Buffer` caused the header
cache size to balloon.  (now fixed).

Also, I've merged: https://github.com/neomutt/neomutt/pull/3898
which reduces the amount of junk we store to the cache.
(something we inherited from mutt).

The result is that the header cache is now ~20% smaller.

Cheers,
    FlatCap / Rich
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