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".
Regards Michael 08.02.2018 07:58, Michael Thayer wrote: > Hello Jonas, > > Thank you, that does look like it. I will tag onto that bug and see > what comes of it. > > Regards > Michael > > 07.02.2018 04:21, Jonas Ådahl wrote: >> The flashing black rectangle you are seeing could possibly be >> https://bugzilla.gnome.org/show_bug.cgi?id=767212. >> >> >> Jonas >> >> On Tue, Feb 06, 2018 at 04:16:51PM +0100, Michael Thayer wrote: >>> Hello, >>> >>> Wondering if anyone can help us with the following question. In >>> VirtualBox we need for various reasons to know what the usable area of >>> each screen is - that translates as the largest rectangle which fits on >>> that screen without obscuring any panels or similar. We find that out >>> by mapping a maximised window on each screen at start-up and checking >>> its position and dimensions. To prevent disturbance to the user we >>> create the window fully translucent, or if the X server does not support >>> that we use XShape and leave only a single pixel visible. On GNOME >>> Shell Wayland edition (what is the right way to say that?) this >>> unfortunately flashes a black rectangle up on the screen in the area >>> which should be translucent. I assume this is Xwayland-related, but is >>> there any way to prevent it? >>> >>> For a bit of background, creating a maximised window as we do was the >>> best way we found of getting the information we need. Qt does not >>> provide it directly, _NET_WORKAREA is not quite the right thing either >>> and not all window managers provide usable strut information as some of >>> them composite panels directly rather than creating windows for them. >>> We use the area found for a number of things, in particular: adjusting >>> the size and position of windows restored from previous sessions if the >>> old positions no longer fit the current layout (especially to prevent >>> windows appearing off-screen) and correctly placing the toolbar windows >>> which we use in seamless mode, which we want to span the bottom >>> (usually) of a given screen, but above any window manager toolbars or >>> panels. Of course, the problem is finding something which works, if not >>> in all window managers, at least for as many popular ones as possible. >>> >>> Thanks! >>> Regards >>> Michael >>> -- >>> Michael Thayer | VirtualBox engineer >>> ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt >>> >>> ORACLE Deutschland B.V. & Co. KG >>> Hauptverwaltung: Riesstraße 25, D-80992 München >>> Registergericht: Amtsgericht München, HRA 95603 >>> >>> Komplementärin: ORACLE Deutschland Verwaltung B.V. >>> Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister >>> der Handelskammer Midden-Nederland, Nr. 30143697 >>> Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher >>> _______________________________________________ >>> gnome-shell-list mailing list >>> gnome-shell-list@gnome.org >>> https://mail.gnome.org/mailman/listinfo/gnome-shell-list > -- Michael Thayer | VirtualBox engineer ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt ORACLE Deutschland B.V. & Co. KG Hauptverwaltung: Riesstraße 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Komplementärin: ORACLE Deutschland Verwaltung B.V. Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister der Handelskammer Midden-Nederland, Nr. 30143697 Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher _______________________________________________ gnome-shell-list mailing list gnome-shell-list@gnome.org https://mail.gnome.org/mailman/listinfo/gnome-shell-list
