[Bug 723236] New: gstcaps: fix gst_caps_get_features return

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723236
  GStreamer | gstreamer (core) | git

           Summary: gstcaps: fix gst_caps_get_features return
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: blocker
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matthieu.bouron at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


gst_caps_get_features returns a preallocated caps structures corresponding to
memory:SystemMemory if the current caps features are NULL.

This behaviour leads to an issue when the user tries to modify the features
using gst_caps_features + gst_caps_features_add since it will directly modifies
the preallocated caps features.

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