Package broke in stable due to old API. Fix in stable or backports?

[Yao Wei <mwei@debian.org>]

Hi,

I have a package `meteo-qt` which is broke due to the use of old API,
which is reported here:
  https://bugs.debian.org/960451

There should be many existing cases, that external service the stable
package is using deprecates the old API, which in turn breaks the
package.  Do we have documented conventions that where the fixed package
should be uploaded to: stable-proposed-updates or backports?

Thanks,
Yao Wei

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