pgAdmin III commit: Fix the not-same-query process on the history combo

Fix the not-same-query process on the history combobox

The history combobox in the query tool could record the same query more than
once. Actually, it is displayed the same way, but the difference is invisible
(spaces, carriage returns, etc).

Per a report from Kozusznik Michal.

Branch
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REL-1_16_0_PATCHES

Details
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http://git.postgresql.org/gitweb?p=pgadmin3.git;a=commitdiff;h=49a3419d195e220493a56da0a1cdebf8ef669835

Modified Files
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pgadmin/frm/frmQuery.cpp |   43 ++++++++++++++++++++++++++++++++-----------
1 files changed, 32 insertions(+), 11 deletions(-)