D11990: use the same bound check as setCurrentItem when setting m_currentItem manually

[Fabian Kosmale]

fabiank added a reviewer: Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11990

To: fabiank, elvisangelaccio, #dolphin
Cc: #dolphin
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