On Wed, Sep 1, 2021 at 8:03 AM Ian Pilcher <arequipeno@gmail.com> wrote:

Yes. I've seen the semi-transparent ghost window issue. I don't have a
reproducer, though, so I haven't dug into it.

X11 on an old ATI GPU if it matters.

I'm running X11 too.

It happened to me today with a Firefox window. I restarted Firefox by killing the Firefox process. When I did that, the Firefox ghost window disappeared. I'm wondering if it has something to do with a shutdown process that doesn't complete enough to erase (or destroy) its window object.