[Pkg-xfce-devel] Bug#470227: Bug#470227: xfce4-mcs-manager: panels disappear when selecting screen for panel to use

[Vincent.McIntyre at csiro.au]

>
> Hmhm, you mean it crashes only when you select the second panel? What if
> you first select the ÿÿPanel 2ÿÿ to configure? Does it crashes too?

Yes, if we select "panel 2" and try to move it from monitor 0 to
monitor 1, xfce4-panel crashes as well.

> If you re-run xfce4-panel (Alt+F2, xfce4-panel), is the panel correctly
> positionned?

The panel appears on monitor 0. If we try to move it to monitor 1 via
the xfce4-mcs-manager panel control, we see the same crash.

> If you run xfce4-panel from a terminal, do you see some
> output when it crashes?

Yes, the output is:
-----------------------------------------------------------------------
The program 'xfce4-panel' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
   (Details: serial 16627 error_code 8 request_code 56 minor_code 0)
   (Note to programmers: normally, X errors are reported asynchronously;
    that is, you will receive the error a while after causing it.
    To debug your program, run it with the --sync command line
    option to change this behavior. You can then get a meaningful
    backtrace from your debugger if you break on the gdk_x_error() 
function.)
-----------------------------------------------------------------------


The .xsession-errors files has these messages which appear before
we try to fiddle with the panel:
-----------------------------------------------------------------------
/etc/gdm/PreSession/Default: Registering your session with wtmp and utmp
/etc/gdm/PreSession/Default: running: /usr/bin/sessreg -a -w /var/log/wtmp 
-u /v
ar/run/utmp -x "/var/lib/gdm/:0.Xservers" -h "" -l ":0" "observer"
/etc/gdm/Xsession: Beginning session setup...
** Message: Querying Xkb extension
** Message: Xkb extension found
** Message: This build doesn't include support for XF86Misc extension
** Message: Querying Xkb extension
** Message: Xkb extension found

** (xfwm4:6633): WARNING **: The display does not support the XComposite 
extension.

** (xfwm4:6633): WARNING **: Compositing manager disabled.
-----------------------------------------------------------------------



In a previous session we also saw many of these warnings, which appear
in the .xsession-errors after xfce3-panel exited with the message above:
-----------------------------------------------------------------------
** (xfdesktop:9173): CRITICAL **: xfdesktop_icon_get_position: assertion 
`XFDESK
TOP_IS_ICON(icon)' failed

** (xfdesktop:9173): CRITICAL **: xfdesktop_icon_get_position: assertion 
`XFDESK
TOP_IS_ICON(icon)' failed
-----------------------------------------------------------------------


Cheers
Vince