Make sure that queries use LIKE with _ escaped

For example:

SELECT nspname
FROM pg_namespace
WHERE nspname NOT LIKE 'pg_%'
  AND nspname != 'information_schema'
ORDER BY nspname

will get every schema whose name isn't information_schema and doesn't begin
with pg (the _ character is a joker character when used with LIKE, meaning
"replace-me-with-one-character-whatever-it-is").

So, we need to escape the underscore to get rid of its special meaning.

CHANGELOG

@@ -37,8 +37,9 @@ Changes
 
 Date       Dev Ver     Change details
 ---------- --- ------  --------------
-2012-03-06 GL  1.14.3  Fix enabling the OK button of the view dialog. Per report
-                       from Colin Beckingham.
+2012-03-06 GL  1.14.3  Make sure that queries use LIKE with _ escaped.
+2012-03-06 GL  1.14.3  Fix enabling the OK button of the view dialog. Per
+                       report from Colin Beckingham.
 2012-03-05 GL  1.14.3  Fix the trigger SQL. Per report from Attila.
 2012-03-01 GL  1.14.3  Another fix on the autovacuum widgets in the table
                        dialog. Report from Bartosz Dmytrak.

pgadmin/dlg/dlgFunction.cpp

@@ -383,7 +383,7 @@ int dlgFunction::Go(bool modal)
 		// create mode
 		restrict = wxT("(typtype IN ('b', 'c', 'd', 'p') AND typname NOT IN ('any', 'trigger', 'language_handler'))");
 		if (!settings->GetShowSystemObjects())
-			restrict += wxT(" AND nspname NOT LIKE 'pg_toast%' AND nspname NOT LIKE 'pg_temp%'");
+			restrict += wxT(" AND nspname NOT LIKE E'pg\\\\_toast%' AND nspname NOT LIKE E'pg\\\\_temp%'");
 
 		DatatypeReader tr(database, restrict);
 		while (tr.HasMore())