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https://issues.apache.org/jira/browse/GUACAMOLE-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15979296#comment-15979296
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Michael Jumper commented on GUACAMOLE-125:
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{quote}
Is the "/f" flag being used in the Guacamole code and if yes, is there a way to
unset it to test?
{quote}
Reading through the FreeRDP source, that flag actually has nothing to do with
the RDP connection, and only affects how FreeRDP's "xfreerdp" client handles
screen dimensions. Specifying it causes the client to request the same
dimensions as the local screen.
Guacamole effectively uses this behavior by default, requesting the same
dimensions as the browser window. Overriding that behavior (the equivalent to
omitting the "/f" flag when running "xfreerdp") would mean specifying the width
and height connection parameters:
http://guacamole.incubator.apache.org/doc/gug/configuring-guacamole.html#rdp-display-settings
{quote}
(I believe the sizes affect the desktop area and not the app itself).
{quote}
They are actually one and the same.
Though RemoteApp appears to forward a specific application via RDP, this is an
illusion. It actually forwards an empty desktop containing the windows of all
applications within that RemoteApp session.
When you see an application directly integrated into the local desktop when
using a native RDP client and RemoteApp, the RDP client is actually copying the
visible regions of windows within the desktop into local windows in the same
locations. In reality, it's still a normal RDP session with a single display,
etc.
> 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: 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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