D7976: Highlighting indexer: factor out checks for smaller while loop

[Volker Krause]

vkrause accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  refactorindexer

REVISION DETAIL
  https://phabricator.kde.org/D7976

To: dhaumann, vkrause
Cc: #frameworks
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