[pkg-go] Bug#983669: syncthing: Mismatching index-ids that can cause index retransfer or inconsistency

[Simon Frei]

Package: syncthing
Version: 1.12.1~ds1-2
Severity: important

As discussed on the go-team mailing list [1], I am filing this bug to
address an important fix in upstream since the version to be included in
stable.

There have been reports of full index retransfers on almost every
restart [2], which uses significant resources (network, disk io, ...).
The underlying bug may also cause inconsistencies in the displayed sync
completion, though that has not been observed.

I propose to apply the PR fixing this [3] with the patch attached.
Please indicate if you'd prefer an MR on salsa, then I'll do that
instead in the future.

[1]: https://lists.debian.org/debian-go/2021/02/msg00067.html
[2]:
https://forum.syncthing.net/t/mismatching-index-id-for-us-on-almost-every-restart-again/16036
[3]: https://github.com/syncthing/syncthing/pull/7211
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