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Revision 3184

Fix bug in the Advanced Search form reported by Dave Balsiger at NTL. The bug occured only in one of the following two special cases:

(a) The user modifies longitude but leaves latitude at default values;
(b) The user modifies latitude but leaves longitude at default values.

There was a conditional AND that should have been coded as a conditional OR. The buggy logic was:

"If the user changes both latitude AND longitude, then use the spatial form values in the advanced search, otherwise ignore the spatial form values."

the correct logic is:

"If the user changes either the latitude OR longitude, then use the spatial form values in the advanced search, otherwise ignore the spatial form values."

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