void () { boolean isCompletionArranger = myArranger instanceof CompletionLookupArrangerImpl; if (isCompletionArranger) { final String lastLookupArrangersPrefix = ((CompletionLookupArrangerImpl)myArranger).getLastLookupPrefix(); if (lastLookupArrangersPrefix != null && !lastLookupArrangersPrefix.equals(getAdditionalPrefix())) { LOG.trace("prefixes don't match, do not clear lookup additional prefix"); } else { myOffsets.clearAdditionalPrefix(); } } else { myOffsets.clearAdditionalPrefix(); } }