D9354: Give more details in the LLCONFLICT error.

[David Faure]

dfaure created this revision.
dfaure added a reviewer: dvratil.
Restricted Application added a project: KDE PIM.

REVISION SUMMARY
  Admittedly this is not very useful to end users, but it is useful to any
  app developer using akonadi.
  
  Example from zanshin:
  
  Cannot deparent task child from its parent: [LLCONFLICT] Resource
  akonadi_icaldir_resource_0 tries to modify item 641403
  (82d006fc-af0d-40cb-8bbe-a7ff75556358) (in collection 1003) with
  revision 5; the item was modified elsewhere and has revision 6, aborting STORE.

TEST PLAN
  Deparenting a task in zanshin's workday view triggered
  this error, due to firing up two ItemUpdateJobs in parallel.

REPOSITORY
  R165 Akonadi

BRANCH
  better_error (branched from Applications/17.12)

REVISION DETAIL
  https://phabricator.kde.org/D9354

AFFECTED FILES
  src/server/handler/store.cpp

To: dfaure, dvratil
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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