Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  39dd49c8097432c0355acc363fe3af7fca4952f8

Make FeatureIndex::getOffsetFromKey slightly more robust

$rows may not always be 0-based with increments of 1, and it's not required for
::filterResults' splice.

Change-Id: I6592a8731ce43bac6e40bfae4c4789adf139803a