D23959: Remove use of deprecated QModelIndex::child method

[Alex Merry]

alexmerry created this revision.
Herald added a project: KDE PIM.
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alexmerry requested review of this revision.

REVISION SUMMARY
  This will reduce warnings when compiling, and likely make the transition to Qt 6 a tiny bit
  simpler. The replacement code is as recommended by Qt documentation, and should be equivalent.

TEST PLAN
  Checked the unit tests pass and that basic operations (reorder, create a folder, move
  entries between folders) still work in the subscription tree in the UI.

REPOSITORY
  R201 Akregator

BRANCH
  deprecated-qmodelindex-call

REVISION DETAIL
  https://phabricator.kde.org/D23959

AFFECTED FILES
  src/subscription/subscriptionlistview.cpp

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