[Bug 702195] New: playbin: Emit {audio,text,video}-changed signals when pads are removed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702195
  GStreamer | gst-plugins-base | git

           Summary: playbin: Emit {audio,text,video}-changed signals when
                    pads are removed
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=246746)
 View: https://bugzilla.gnome.org/attachment.cgi?id=246746
 Review: https://bugzilla.gnome.org/review?bug=702195&attachment=246746

Emit *-type signals in pad_removed_cb

Playbin only emits it's *-changed signals when pads are added. I assume we
should also emit it when pads are removed.

This caused problems for me in WebKit because we were holding onto pads after
their input-selectors were deleted.

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