[X2Go-Dev] Bug#872: Bug#872: Turn xinerama.conf file related code inside X2Go Client into legacy code (for NX agents << 3.6)

[Oleksandr Shneyder]

Hi Ulrich,

yes, if you moving window between two physical displays, without
resizing it, x2goagent doesn't know, that display configuration is
changed, because geometry of the x2goagent stays same. So I resized a
window to refresh a display configurations.

regards,
Alex
Am 18.05.2015 um 13:28 schrieb Ulrich Sibiller:
> On Mon, May 18, 2015 at 11:23 AM, Oleksandr Shneyder
> <o.shneyder at phoca-gmbh.de> wrote:
>> ok, let's wait till this feature is available in nxagent and I'll put
>> support for it in x2go client.
> 
> 
> Ok. But can you please explain the reason for that off-by-one window
> size code I found (see below)?
> 
>>>>> On  Do 14 Mai 2015 23:32:03 CEST, Ulrich Sibiller wrote:
>>>>>
>>>>>> while testing my xinerama re-implementation I noticed that x2goclient
>>>>>> reports a wrong width sometimes when simply moving the window without
>>>>>> changing the size. The reported size differs by one pixel  (too much
>>>>>> or too little). When running x2goclient --debug you can see this:
>>>>>>
>>>>>> x2go-DEBUG-../src/onmainwindow.cpp:10160> "New proxy geometry: (x:
>>>>>> 329, y: 214, w: 1440, h: 900"
>>>>>> x2go-DEBUG-../src/onmainwindow.cpp:10160> "New proxy geometry: (x:
>>>>>> 365, y: 213, w: 1440, h: 900"
>>>>>> x2go-DEBUG-../src/onmainwindow.cpp:10160> "New proxy geometry: (x:
>>>>>> 825, y: 190, w: 1440, h: 900"
>>>>>> x2go-DEBUG-../src/sshprocess.cpp:189> executing remote command via
>>>>>> SshProcess object (24): "export DISPLAY=:50;printf '\''1095 0 345
>>>>>> 900\n0 0 1095 900'\'' >
>>>>>> $HOME/.x2go/C-uli-50-1431636769_stDKDE_dp24/xinerama.conf"
>>>>>>
>>>>>> -> here the 345 should have been a 344.
>>>>>>
>>>>>> Interestingly my patched x2goagent (that completely ignores
>>>>>> xinerama.conf) sees that value. So I conclude that x2goclient is
>>>>>> manipulating the nxproxy window size by one pixel itself. Disabling
>>>>>> xinerama in the session's configuration fixes the problem.
>>>>>>
>>>>>> That off-by-one behaviour is caused by this code in onmainwindow.cpp:
>>>>>>
>>>>>> void ONMainWindow::slotXineramaConfigured()
>>>>>> {
>>>>>>     if (resumingSession.fullscreen)
>>>>>>         return;
>>>>>>     if (xinSizeInc == -1)
>>>>>>         xinSizeInc=1;
>>>>>>     else
>>>>>>         xinSizeInc=-1;
>>>>>> #ifdef Q_OS_LINUX
>>>>>>
>>>>>> lastDisplayGeometry.setWidth(lastDisplayGeometry.width()+xinSizeInc);
>>>>>>     XSync(QX11Info::display(),false);
>>>>>>     XResizeWindow(QX11Info::display(), proxyWinId,
>>>>>>
>>>>>> lastDisplayGeometry.width(),lastDisplayGeometry.height());
>>>>>>     XSync(QX11Info::display(),false);
>>>>>> #endif
>>>>>> #ifdef Q_OS_WIN
>>>>>>     QRect geom;
>>>>>>     wapiWindowRect ( (HWND) proxyWinId, geom );
>>>>>>     wapiMoveWindow( (HWND) proxyWinId, geom.x(), geom.y(),
>>>>>> geom.width()+xinSizeInc, geom.height(),true);
>>>>>>     lastDisplayGeometry=proxyWinGeometry();
>>>>>> #endif
>>>>>>     xineramaTimer->start(500);
>>>>>> }
>>>>>>
>>>>>> If I set xinSizeInc to zero in all cases the off-by-one behaviour is
>>>>>> completely gone. Why does xinSizeInc exist at all?
> 
> Uli
> 


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Oleksandr Shneyder        | Email: o.shneyder at phoca-gmbh.de
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