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https://issues.apache.org/jira/browse/GUACAMOLE-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018992#comment-16018992
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Fermi Jiang commented on GUACAMOLE-125:
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In the above test, chrome is running in Windows 8.1 Pro with dual monitors 
1600x900 and 1920x1080 (the latter one is used for the test).

The xfreerdp is running in CentOS 7 in Visual Box VM with screen resolution 
1920x975.

The RDP server is running Window Server 2016 in Hyper-V VM with screen 
resolution 1600x900.

The windows applicaiton is just a sample MFC project, though I think it is 
irrelevant. The guacamole I tested was customized by other developers. But most 
of the modification were related to authentication, access, labels on menu, etc.

I cannot understand why there are two same remote applications displaying in 
xfreerdp. The session appeared to be taken over, because I can see one client 
in the other out. Initially in guacamole, I can only see one remote 
application, no matter how I move or resize the window. I can see only one 
process in the task manager as well. But after guacamole out and xfreerdp in, I 
can see two same windows stacked together (putting the top one aside). I can 
see two processes listed in the task manager. After xfreerdp out and guacamole 
back again, the two windows remained there.


> Sometimes session is not initialised on Full screen 
> ----------------------------------------------------
>
>                 Key: GUACAMOLE-125
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-125
>             Project: Guacamole
>          Issue Type: Bug
>    Affects Versions: 0.9.9, 0.9.10-incubating
>         Environment: Guacamole running on Debian 8.6
> Forwarding a windows 2012 R2 session
>            Reporter: Frank Giroud
>            Priority: Minor
>         Attachments: fj1.png, fj2.png, fj3.png, fj4.png, fj5.png, fj6.png, 
> notepad_size_limit_detail.jpg, notepad_size_limit.jpg
>
>
> Sometimes after logging in (which happens to be Full scren) the windows 
> session or the RemoteApp is not launched in full screen.
> In fact it behaves like there were a pseudo-resolution smaller than the 
> required one.
> The browser (Chrome is open in a 1920*1200) but the screen displayed is 
> locked to something like 1024*768 or so. 
> When you click on the Fullscreen button. It open and let a black screen all 
> around in the web browser. .
> -The behavior is the same if you start a windows session , the windows 
> desktop displayed in the web browser is in a 'smaller display' and what 
> remains is black.- Haven't succeed to reproduce after all
> I have succeeded to find a way to reproduce the behavior "kind of" more often.
> In my example i configure notepad++ to be a remoteapp (launch by ||notepad in 
> guacamole )
> # Launch a session through Guacamole => No probleme guacamole can be set in 
> fullscreen (on all the browser window)
> # Unmaximized the application
> # Ctrl-Shift-Alt menu => Disconnect
> # On the guacamole option menu (3 choices) => Reconnect
> # The result => my screenshot



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