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On 2011-12-02T11:29:10+00:00 Ignat wrote:

Hi,

I am running ubuntu 11.04 and xfce 4.8 on 2 display machine and
sometimes panel is missing all windows from specific display.

I configured 2 panels on each display with parameter to display only
windows from associated display.


If you need more info I will gladly provide it.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/0

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On 2012-03-16T16:31:56+00:00 Pepijn-k wrote:

I have the same setup on Arch linux; 2 displays, one panel on each
display, window buttons in each configured to show only windows for that
monitor.

What I'm seeing is that all windows show up correctly initially, but
after a while some of the buttons go missing. I have been able to
pinpoint which action actually triggers the window buttons to disappear.
I only notice this when it's too late already.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/1

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On 2012-03-21T14:58:44+00:00 Vestrum wrote:

I have noticed when using Matlab, a Java-based GUI. I can reproduce it
reliably:

Start Matlab, select Help -> Product Help, then back in the main window,
File -> New -> Class. Then close the Editor while watching the Panel.
Both the Editor and main MATLAB window buttons will disappear, even
though Matlab is still running.

I think this is the same issue with Java-based GUIs that affected the
gnome panel, see:
https://bugs.launchpad.net/ubuntu/+source/libwnck/+bug/144406 and
http://cgit.compiz.org/compiz/plugins/workarounds/commit/?h=compiz-0.8&id=79f11ed2cd71d2155a5e04aa8803c56633b212bb.
>From that page:

"Certain java applications set themselves to be transient when they open
a modal dialog, causing them to disappear from the taskbar window list.
This workaround notices when the transient property is unset and adds
the window back to the taskbar."

I've taken a peek at the source for the tasklist but I'm not sure how to
work this in.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/2

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On 2012-03-21T15:07:29+00:00 Pepijn-k wrote:

I'm only seeing this with IntelliJ IDEA; also a Java-based application.
I was talking to a friend yesterday about this and he sees the same
behaviour with Java apps.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/3

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On 2012-03-21T17:09:39+00:00 Pepijn-k wrote:

I had a more in depth look at the ubuntu bug that was linked to. The
workaround for Java windows was done in compiz. If you extrapolate that
to xfce then the same fix should probably be done in xfwm rather than in
the window buttons panel plugin.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/4

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On 2012-03-26T19:36:50+00:00 Vestrum wrote:

More data:

Using gnome-panel with metacity, the bug DOES NOT occur.
Using xfce4-panel with metacity, the bug DOES NOT occur.
Using gnome-panel with xfwm4, the bug DOES occur.
Using xfce4-panel with xfwm4, the bug DOES occur.

So, that would seem to point to the window manager rather than the
panel.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/5

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On 2012-05-14T13:55:52+00:00 kvaso wrote:

maybe this would help to fix it:
http://youtrack.jetbrains.com/issue/IDEA-17899#comment=27-169762 (look for 
explanation by Serge Baranov)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/6

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On 2012-05-14T13:57:24+00:00 kvaso wrote:

also note, that this is not happening only for 2 display machines as
stated earlier

Reply at:
https://bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bug/1192688/comments/7


** Changed in: xfce4-panel
       Status: Unknown => Confirmed

** Changed in: xfce4-panel
   Importance: Unknown => Medium

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  MATLAB's Java windows disappear from the taskbar

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