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Re: Starting VirtualBox 5 GUI creates two windows, but only with Cygwin/X


With recent Cygwin the problem became harder to reproduce: it only works
once. On subsequent launches of VirtualBox the extra window appears in
the taskbar for about a second and then closes. You have to restart X
server to see the bug again.

In the meantime I installed xwininfo. Beside "xwinclip" it shows 3 or 2
children of the root window.

    xwininfo: Window id: 0x61 (the root window) (has no name)

      Root window id: 0x61 (the root window) (has no name)
      Parent window id: 0x0 (none)
         4 children:
         0x80000b "Oracle VM VirtualBox Manager": ("VirtualBox"
"VirtualBox")  770x550+8+30  +8+30
         0x800002 "VirtualBox": ("VirtualBox" "VirtualBox")
1366x768+0+0  +0+0
         0x800004 (has no name): ()  1x1+0+0  +0+0
         0x600001 "xwinclip": ()  500x500+1+1  +1+1

Closing the window with right click on taskbar does not change the
number of windows, just changes Map State of "VirtualBox" from
IsViewable to IsUnMapped.

On second run there's no "VirtualBox" at all. I think it's the one that
disappears quickly.

Could it be some signed/unsigned thing with window id counter in the X

30.03.2016 16:18, Jon Turney ÐÐÑÐÑ:
> On 27/03/2016 19:34, Basin Ilya wrote:
>> I often use X11 forwarding to run Linux programs with GUI. Recently
>> I upgraded from vbox 4 to version 
>> VirtualBox-5.0-5.0.16_105871_el6-1.x86_64. (My Linux host is 
>> headless Rhel 6.7 Server with xorg-x11-xauth package installed)
>> I noticed that when I type "VirtualBox" in shell and then close
>> its window the process remains running. Then I noticed that there's
>>  another hidden window in taskbar. I have to press Ctrl-C or close
>>  the second window to end the process.
>> This only happens when I connect from Windows and use cygwin xwin 
>> server (but not xming or Linux client)
>> The visible window is captioned "Oracle VM VirtualBox 
>> Manager@hostname" and the hidden one is captioned 
>> "VirtualBox@hostname"
>> It's not really hidden. There's a white pixel at the top-left edge
>>  of my second monitor
> Thanks for reporting this.
> I tried to reproduce this issue with that VirtualBox RPM on a Centos
>  6.7 VM, without success.
> It's not unusual for X clients to create 1x1 pixel windows which
> only exist to receive events, but such windows are usually hidden by
>  making them InputOnly.
> You could possibly explore this a bit using xwininfo, to determine
> if this is a bug with VirtualBox (where the window isn't being
> correctly marked as hidden) or XWin (where the window is being show,
> desipte the fact it should be hidden)

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