[pgAdmin III] #378: Editing table properties drops all foreign keys and recreates them

#378: Editing table properties drops all foreign keys and recreates them
------------------------------+---------------------------------------------
 Reporter:  Patrice Lefebvre  |       Owner:  dpage
     Type:  bug               |      Status:  new  
 Priority:  minor             |   Milestone:       
Component:  pgadmin           |     Version:  trunk
 Keywords:  foreignkeys       |    Platform:  all  
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 When I open the properties on a table containing foreign key constraints,
 and then to go the SQL tab to see what will be executed, I notice all
 foreign keys are dropped and then recreated. For example when I open the
 table properties for the table zulook.inv_equipment on my database, the
 SQL pane reads as follow:

 ALTER TABLE zulook.inv_equipment
    DROP CONSTRAINT inv_equipment_company_entity_id_fkey;
 ALTER TABLE zulook.inv_equipment
    DROP CONSTRAINT inv_equipment_item_id_fkey;
 ALTER TABLE zulook.inv_equipment
    ADD CONSTRAINT inv_equipment_company_entity_id_fkey FOREIGN KEY
 (company_entity_id)
        REFERENCES zulook.ab_company (company_entity_id) MATCH SIMPLE
        ON UPDATE NO ACTION ON DELETE NO ACTION DEFERRABLE INITIALLY
 IMMEDIATE;
 ALTER TABLE zulook.inv_equipment
    ADD CONSTRAINT inv_equipment_item_id_fkey FOREIGN KEY (item_id)
        REFERENCES zulook.inv_item (item_id) MATCH SIMPLE
        ON UPDATE NO ACTION ON DELETE NO ACTION DEFERRABLE INITIALLY
 IMMEDIATE;


 I didn't have this behaviour problem under 1.12.x versions, I've noticed
 it starting with 1.14.x versions, and now it is still present in 1.16.0. I
 use pgAdmin 1.16.0 (Sep 7 2012, rev: REL-1_16_0, from binary) under
 Windows XP SP3, English version but on a Canadian French OS.

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Ticket URL: <http://code.pgadmin.org/trac/ticket/378>
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