D28041: Use range constructor to compile with Qt 5.14

[Yuri Chornoivan]

yurchor created this revision.
yurchor added a reviewer: KDE Applications.
Herald added a project: Documentation.
Herald added a subscriber: kde-doc-english.
yurchor requested review of this revision.

REVISION SUMMARY
  KHC does not compile with Qt 5.14
  
  BUG: 418838

TEST PLAN
  tested for Qt 5.12 only

REPOSITORY
  R125 KHelpCenter

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28041

AFFECTED FILES
  searchhandlers/cachereader.cpp

To: yurchor, #kde_applications
Cc: kde-doc-english, gennad, fbampaloukas, skadinna
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