it is the blackscreen window. Generally it should be a colorful triangle
wayland-screenshot_blackscreen.png (image/png), 8.67 KB, created by qwang13 on 2014-05-16 06:26:08 UTC
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Creator: qwang13
Created: 2014-05-16 06:26:08 UTC
Size: 8.67 KB
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Attachments on bug 78771: 99139 | 99150 | 99256 | 99295

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