[Bug 756738] gst_registry_plugin_filter() and gst_registry_feature_filter() callbacks can't use any API using the registry

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756738

--- Comment #10 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Ran some stupid benchmarks out of curiosity (average run of 10000 cycles;
always with first=false):

--------------------
RPI2 (1336 features)
--------------------

          match-none  match-all
current        28us     838us
list-copy     592us    1392us
iterator     5382us    6158us

-----------------------
core i7 (1347 features)
-----------------------

         match-none   match-all
current        7us       59us
list-copy     36us       89us
iterator     364us      405us


Even on an rpi the impact is in the area of 0.5 milliseconds in the worst case
scenario (full iteration). Since this is not something that's done a lot that
strikes me as not something to worry about too much. Adding complicated new API
for a task like this just to maintain a small performance advantage for
something that's not super performance sensitive seems unnecessary to me. Also
the iterator API is considerably slower than my proposed solution.

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