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Description of problem:
It seems that advanced bugzilla searches using the OtherBugsDependingOnThis
field do not correctly allow for exclusion of those bugs already on a blocker
list.  (The desired goal is to search for bugs that are not currently on one of
the two appropriate blocker lists, so that, once identified, they can be fixed.)


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. choose the advanced bugzilla query mechanism
2. select "only include" bugs numbered: 173280
3. under "Advanced Searching Using Boolean Charts", select these values:
      "OtherBugsDependingOnThis" : "does not contain the string" : 168424

Actual Results:  A bug list is generated that *does* include 173280.  This is wrong
because that bug blocks two different other bugs: 168424 and 171043

Expected Results:  The bug list should be empty.

Additional info:

I've tried over a dozen combinations of negating charts and various ways
of searching for words, strings, regexps, and such in that field.  It seems
that every bug that blocks multiple others is wrongly included in the result.