SDL apps open a second black window titled "OpenGL test" or "Mir surface"

[dinamic]

Ubuntu 17.04 Unity8

neverball opens a second black window, maximizing the window crashes unity8

start neverball without Xmir (it's an SDL2 app i think)
you'll now see a black window behind the neverball window titled "OpenGL test" (see screenshot), now try to maximize that black window, here it just crashes unity8

[dinamic (dinamic6661)]

unity8 log before crash

[2017-03-25:09:39:16.241] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:16.892] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:17.679] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:18.312] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:19.077] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:20.412] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:23.481] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:24.965] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::activate()
[2017-03-25:09:39:24.966] qtmir.surfaces: MirSurface[0x56364aa4bd00,"neverball"]::requestState(maximized)
terminate called after throwing an instance of 'std::out_of_range'
  what(): map::at
()

[dinamic (dinamic6661)]

there are more bugs in this bug report,
1. the black window
2. neverball window is transparent
3. if you resize the window it doesn't resize well
4. if you resize/close the black window it crashes unity8

[Daniel van Vugt (vanvugt)]

The unity8 crash in "what(): map::at" is pretty common but I'm not sure if we have one or more remaining causes of that. See bug 1668466, bug 1672012

[Daniel van Vugt (vanvugt)]

Also, bug confirmed. Unity8 fails to launch Neverball from the app drawer but I can get it running from ssh:
   neverball -- --desktop_file_hint=unity8
and now I can see this bug.

However, I also know that SDL likes to probe the server with some early connections so this might be a duplicate of bug 1577641 if SDL is leaking a duplicate MirConnection. Fixing either SDL or Unity8 (bug 1577641) should do the trick.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Same bug in neverputt. Looks like the SDL/Unity8 issues mentioned in comment #5.