[Bug 775786] New: gst_structure_is_subset() conflicts with the design docs

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775786

            Bug ID: 775786
           Summary: gst_structure_is_subset() conflicts with the design
                    docs
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ystreet00 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

The design docs say that the superset can contain extra fields that are not in
the subset (which makes sense from a mathematics point of view).  The API docs
and implementation don't allow this.

i.e.

gst_structure_is_subset (SUBSET: "test/test, channels=(int)1",
    SUPERSET: "test/test, channels=(int)1, rate=(int)1")
returns FALSE.

The implementation also allows the subset to contain extra fields not in the
superset.

gst_structure_is_subset (SUBSET: "test/test, channels=(int)1, rate=(int)1",
    SUPERSET: "test/test, channels=(int)1")
returns TRUE.

The only condition I could think of where this makes sense is that no field
means any value rather than no value in which case the design docs need
updating.

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