Re: Unexpected visual effect under GNOME Shell

[Olivier Fourdan <ofourdan redhat com>]

Hi,

On Thu, Feb 8, 2018 at 1:34 PM, Michael Thayer <michael thayer oracle com> wrote:

We created a test case application for Olivier and he decided it is a
different case after all.  xprop says that the black window is
WM_NAME-ed "mutter guard window".

Yeah, FWIW, in the Qt example provided in bug 767212, if I remove the “Qt::FrameLessWindowHint” from the window widget creation, it works. I can even resize the window move it around, it's perfectly transparent and I don't see any black border artefacts as in bug 767212.

So I wonder if “Qt::FrameLessWindowHint” translates as an override redirect window on X11, which might be a bit of a grey area, as O-R are mostly ignored by the WM on X11. I don't know enough of Qt to tell.

Cheers,

Olivier