[gnome-db] update_row not implemented in GdaDataModelHash

[Armin Burgmeier <armin arbur net>]

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Is there any particular reason why there is no implementation for
update_row (from GdaDataModelRow) implementation in GdaDataModelHash? It
seems pretty straightforward and I implemented something that seems to
work. If you are OK with it I could commit it, or also attach it to a
bugzilla bug if you want to review it first.

Without update_row, showing a GdaDataModelHash in a GnomeDbGrid produces
an error when one wants to commit changes. There still seems to be
another problem with GdaDataModelHash (the grid does not update its UI
after committing), but this has probably nothing to do with update_row.

Greetings,
Armin
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