[Bug 770158] element: Add API to more easily post messages about flowing issues

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770158

--- Comment #13 from Thibault Saunier <tsaunier at gnome.org> ---
(In reply to Tim-Philipp Müller from comment #11)
> There's another bug from a couple of years ago about this (but without
> patches) somewhere :)
> 
> My main question is: how would who/what use this? Does any application
> really gain anything by being able to tell whether the flow error was
> not-negotiated or not-linked? Currently it looks a bit like doing it just
> because we can, I don't understand the envisioned use case yet.

My use case is validate where I am currently implementing smarter reporting
when we get a NOT NEGOTIATED error trying to explain the user what happened and
what lead to that error, so I need a way to actually know that the error is a
NNE.

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