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 _______________________________________________ gnome-shell-list mailing list gnome-shell-list@gnome.org https://mail.gnome.org/mailman/listinfo/gnome-shell-list
