BUG #6640: pg_dump does not always dump data of tables marked as editable in extension

The following bug has been logged on the website:

Bug reference:      6640
Logged by:          Regina Obe
Email address:      lr@pcorp.us
PostgreSQL version: 9.1.3
Operating system:   Any
Description:=20=20=20=20=20=20=20=20

This seems to be only an issue if a user individually chooses to backup a
table marked as editable in an extension, but works fine if full backup is
chosen.

The particular extension in question here is PostGIS.

Please refer to:
http://trac.osgeo.org/postgis/ticket/1815

for details.
In short -- if I do a full backup of a database, a table marked as editable
gets its data backed up as expected, but if I try to backup a schema the
table is in or the table itself, pg_dump does not dump anything.