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
