Bug 151281

Cause: QN-ItQ

• Evidence: "This patch makes one SQL call to find out the visibility status of all the bug in the list, instead of one for each bug", comment 1
• Evidence: " b.m.o would have been doing one query for every bug with more duplicates than the minimum limit (currently set to 2.) That would have been many thousands of bugs. :-(", comment 1

Fix: CQ

• Evidence: In the diff file, the query is moved to outside of the loop, effectively combining a log of queries into one query