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Remove gst_caps_union(), use gst_caps_merge(). This function was not used
anymore and it is unclear what the difference is with _merge().

Get the template caps of the pads only once, avoids unecessary ref
and unrefs.

Delay _make_writable() until we actually found a list and need to update the
caps.

A simple caps is already simplified, no need to check for fixedness.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=671911

Make gst_caps_normalize() take ownership of the input so that it can more
intelligently decide when to copy or not.

Rename _do_simplify() to _simplify(). The name was introduced as a replacement
method for a deprecated method but we can now rename it again.
Fix some docs.

Make gst_caps_do_simplify() take ownership of the input caps and produce a
simplified output caps. This removes the requirement of having writable input
caps and the method can make the caps writable only when needed.

with the new caps API, there is more sharing and less copying going on so the
unit test refcounts are different.

Rework some caps operations so they don't rely on writable caps but instead take
ownership of the input caps and do _make_writable() only when needed.
Remove some const from caps functions, it does not make much sense for
refcounted objects and does not allow us to return a refcount to the const input
caps.
Rework the base classes fixate vmethods to not operate on the caps in-place.
All this saves us around 30% of caps and structure copy and new operations.

Having const on refcounted objects require us to make copies instead of simply
taking a ref, don't do that.

Avoid doing a useless copy when the caps are fixed and simplify will not do
anything.

shortcut heavy work when buffer_resize does nothing.
Avoid an extra _ref when mapping a buffer.
Add some G_LIKELY.

Make a helper function check_sticky to check and push pending sticky events.
Move the handling of the result of pushing the sticky event inside the
push_event function, we need to mark the event as received when it was pushed
correctly.
Move the sticky events code outside of gst_pad_push_event_unchecked and
make it purely handle sending the event to the peer.
when pushing a sticky event, first store it on the pad. Then check and push any
pending sticky events when we get a serialized or sticky event on a srcpad. This
fixes the issue where sticky events are not pushed when an event is pushed.

If the foreach function changes the received state of the sticky event, make
sure we remember that.

Sticky events pushed on an unlinked pad should be stored on the pad. When the
pad is then linked and an event is pushed, the event should be merged with the
already existing sticky events and then the sticky events should be pushed in
the order that they were originally pushed.

Doesn't fail in 0.11 of course, at least not on my machine.

Conflicts:
	common
	gst/gstpad.h
	gst/gsttask.c
	libs/gst/base/gstcollectpads2.h

Makes it possible to define those calls to something for tracing.

For make foo/bar.check-norepeat target.

Should reproduce 'GStreamer-WARNING **: wrong STREAM_LOCK count 0'
warnings (with make pipelines/seek.torture or pipelines/seek.forever
anyway, since it appears to be racy).

https://bugzilla.gnome.org/show_bug.cgi?id=670846

There isn't really any need to provide public API for that. It's not
used anywhere in practice, and we aim to provide an API that works
for GstCaps, not some kind of generic set manipulation API based on
GValue. Making this private also makes it easier to optimise this
later. We can always put it back if someone actually needs it.

Because gst_pad_get_pad_template_caps() returns ANY when there is no template,
the query caps function should also return ANY when there is no template (and no
pad current caps) instead of EMPTY.

Conflicts:
	libs/gst/base/gstbaseparse.c
	libs/gst/base/gstbasetransform.c
	plugins/elements/gsttee.c