D6943: upgrade: allow for `sidedata` removal

[marmoute (Pierre-Yves David)]

marmoute added inline comments.

INLINE COMMENTS

> martinvonz wrote in test-sidedata.t:74-75
> Looks like this change should be in the parent

Actually, the text should says "downgrade from", on my way to fix that

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6943/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6943

To: marmoute, #hg-reviewers
Cc: martinvonz, mjpieters, mercurial-devel