D21737: Fix infinite loop when mThreadingCache is 'corrupted'

[Albert Astals Cid]

aacid created this revision.
Herald added a project: KDE PIM.
Herald added a subscriber: kde-pim.
aacid requested review of this revision.

REVISION SUMMARY
  For some reason i have a mThreadingCache that if you obey with the eyes closed creates loops in the threading and thus kmail gets stuck when trying to show that folder

TEST PLAN
  Folder no longer gets stuck in an infinite loop

REPOSITORY
  R94 PIM: Message Library

BRANCH
  Applications/19.04

REVISION DETAIL
  https://phabricator.kde.org/D21737

AFFECTED FILES
  messagelist/src/core/model.cpp

To: aacid
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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