d77354eaec
Various filters that were meant to prevent dumping of table data were not being applied to extension config tables, notably --exclude-table-data and --no-unlogged-table-data. We also would bogusly try to dump data from views, sequences, or foreign tables, should an extension try to claim they were config tables. Fix all that, and refactor/redocument to try to make this a bit less fragile. This reverts the implementation, though not the feature, of commit 7b070e896ca835318c90b02c830a5c4844413b64, which had broken config-table dumping altogether :-(. It is still the case that the code will dump config-table data even if --schema is specified. That behavior was intentional, as per the comments in getExtensionMembership, so I think it requires some more discussion before we change it.
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