[MAINTENANCE] Do we have any backwards-compatibility policy for third-party packages?

[Ihor Radchenko <yantar92@posteo.net>]

Hi,

Org promises to support the last three Emacs releases.
However, it is less clear what is our policy wrt third-party packages.

We do need third-party packages, for example, in babel backends.
Sometimes, we have to make changes to the ob-*.el files in order to
accommodate changes in the required third-party packages. Like in recent
changes to ob-scheme where `run-geiser' function is now obsolete
upstream.

Should we try to support obsolete functions/variables in third-party
packages? Should we try to work around breaking changes and support both
before/after package versions?

The answer is not obvious as older Emacs versions might not be supported
by some third-party packages. Then, logically, we have to support older
package versions compatible with the oldest Emacs version we support.
But it might be hard to keep track of such scenarios.

WDYT?

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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