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Sometimes when you open The Gimp, it shows 3 window list (main window, toolbox window, and docks window) in the panel. It happen because you are activating compiz and not setting it yet.

This is very wasful space and not eye catching in your panel.

To solve it just follow the step I found from https://bugzilla.redhat.com/show_bug.cgi?id=466622 :

1. Open your terminal
2. Type :

   $ gconftool-2 -s /apps/compiz/general/allscreens/options/active_plugins --type=list --list-type=string `gconftool-2 -g /apps/compiz/general/allscreens/options/active_plugins | sed 's/\]//'`,winrules]
   $ gconftool-2 -s /apps/compiz/plugins/winrules/screen0/options/skiptaskbar_match --type string "type=Utility"

   Or follow this step :

   1. Open your CompizConfig Setting Manager (System -> Preferences -> CompizConfig Setting Manager). If you didn’t find it, install it by typing sudo apt-get install compizconfig-setting-manager in your terminal.
   2. Activate Window Rules and then open it.
      
   3. Type : type=Utility in the Skip Taskbar field.
      

   After restarting Gimp you should saw The Gimp only have one item in the window list panel.
   

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