>> I can produce the problem by starting an xterm and clicking (or double 
>> clicking) the title bar.  It moves one pixle to the upper left. 
>> Same xclock, and xfontsel, but not xfig, xpdf or any software built on gnome.
>> Since I use a touchpad with separate mouse bottons, we can't blame a tremor 
>> for that.
>> New since my recent upgrade to natty.
>> 
>> ProblemType: Bug
>> DistroRelease: Ubuntu 11.04
>> Package: xterm 268-1ubuntu1
>> ProcVersionSignature: Ubuntu 2.6.38-15.59-generic 2.6.38.8
>> Uname: Linux 2.6.38-15-generic x86_64
>> Architecture: amd64
>> CompizPlugins: 
>> [core,bailer,detection,composite,opengl,decor,regex,winrules,mousepoll,resize,gnomecompat,wall,compiztoolbox,animation,wobbly,extrawm,workarounds,place,vpswitch,imgpng,move,session,expo,ezoom,staticswitcher,ring,fade,scale]
>> CompositorRunning: compiz
> 
> I don't see the window manager mentioned (presuming it is the gnome bundled
> stuff).
> 
> It's possible that you're exposing yet another bug in compiz.
> 
> xterm patch #268 introduces a feature for toggling to full-screen mode,
> which I see is triggered in some configurations by the gnome window 
> manager(*)).
> That's over a year old, by the way.  #269 makes the feature configurable,
> e.g., the "fullscreen" resource.
> 
> (*) this is a feature of the window manager, not xterm, and would normally
>     be addressed by configuring the window manager...
> 
> You should be able to verify if it is a compiz bug by temporarily disabling
> that aspect of your configuration.

I think I am using compiz as my window manager (wobbly windows and
stuff).  When doing "metacity --replace" xterm does not move anymore
when clicking the titel bar.

This should not be a problem with xterm, because the same happens with
other legacy X11-programs (xclock, xfontconfig).  The simplest piece
of software exhibiting the problem is xmessage.  The issue must be
with the interaction between one of the libraries xmessage binds and
compiz

$ ldd /usr/bin/xmessage | sort
        /lib64/ld-linux-x86-64.so.2 (0x00007f9af4443000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9af3870000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f9af29ef000)
        libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 
(0x00007f9af2e0f000)
        libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007f9af302b000)
        libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f9af27e9000)
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 
(0x00007f9af3c05000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 
(0x00007f9af25e6000)
        libXaw.so.7 => /usr/lib/libXaw.so.7 (0x00007f9af41a6000)
        libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 
(0x00007f9af2bf3000)
        libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 
(0x00007f9af23e0000)
        libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 
(0x00007f9af365e000)
        libXmu.so.6 => /usr/lib/libXmu.so.6 (0x00007f9af3444000)
        libXpm.so.4 => /usr/lib/libXpm.so.4 (0x00007f9af3233000)
        libXt.so.6 => /usr/lib/x86_64-linux-gnu/libXt.so.6 (0x00007f9af3f40000)
        linux-vdso.so.1 =>  (0x00007fff6d3ff000)

Hope this helps.

-- 
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which is subscribed to xterm in Ubuntu.
https://bugs.launchpad.net/bugs/1002972

Title:
  xterm moves to upper left when clicking titel bar

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