[Bug 785199] New: gst_gl_window_dispmanx_egl_set_window_handle() removes foreign native window (element)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785199

            Bug ID: 785199
           Summary: gst_gl_window_dispmanx_egl_set_window_handle() removes
                    foreign native window (element)
    Classification: Platform
           Product: GStreamer
           Version: 1.12.2
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: HHG01200 at nifty.ne.jp
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I'm not sure it is a bug or not.

On Raspberry Pi3, gst_gl_window_dispmanx_egl_set_window_handle() removes native
window (element), regardless it was foreign window handle (set via
gst_video_overlay_set_window_handle()) or not.

This prevents glimagesink reusable.
(PAUSED -> READY -> PAUSED does not work)

I think, at least, a native window handle set via
gst_video_overlay_set_window_handle() should not be released by GStreamer.

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