D26184: QHash::unite is deprecated in qt5.15. We need to port to QMultiHash.But QMultiHash::unite was added in qt5.13

[Laurent Montel]

This revision was automatically updated to reflect the committed changes.
Closed by commit R276:6634451a6279: QHash::unite is deprecated in qt5.15. We 
need to port to QMultiHash.But… (authored by mlaurent).

REPOSITORY
  R276 KItemViews

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D26184?vs=72068&id=72194

REVISION DETAIL
  https://phabricator.kde.org/D26184

AFFECTED FILES
  src/kextendableitemdelegate.cpp

To: mlaurent, dfaure
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns