Fix overflow of inset over text (see #9224)

The symptoms are the same as the original #9224, but the reason is different. In the new code, the width of justified rows includes the Row::separator value. Therefore the CRC computed in ParagrahMetrics::computeRowSignature is not updated in some cases.

The fix is to add Row::separator as one of the elements of the row crc.
Merge remote-tracking branch 'github/build-bot-master' into bleeding-edge-master
2014.11.14-11.00