BUG #5390: pg_dump does not check/include additional schema dependencies when writing schema/search path

The following bug has been logged online:

Bug reference: 5390
Logged by: Timothy Seever
Email address: tim(dot)seever(at)gmail(dot)com
PostgreSQL version: 8.3.5, others
Operating system: Linux/RHEL5.2
Description: pg_dump does not check/include additional schema
dependencies when writing schema/search path
Details:

To reproduce:

1. Create schema A
2. Create schema B
3. Create function in schema A which depends on something in schema B
without specifying it (i.e. the connected user has B included in the
search_path, and the function A.xyz() has something like val := yyz();
where yyz is actually B.yyz.
4. This works properly in place due to the search path... however upon
dumping/restoring, pg_dump only specifies the single schema+public before
each section, so it will fail to add A.xyz()/view/etc leading to cascaded
missing items.