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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1. Main window
2. Toolbox window
3. Docks window

Mungkin ini agak mengganggu, dan boros-borosin space taskbar saja. Sebenarnya, window list ini hanya tampil 1 saja kalo kita ga ngaktifin compiz, jadi permasalahannya adalah pada compiz yang tidak menyembunyikan Utility window.

Kalo mau (kalo ga mau ya ga usah dibaca mas) menyembunyikan 2 window selain main window coba cara berikut. Namun sebelumnya, pastikan setingan 2 window tersebut termasuk Utility window, caranya melihat setingannya :

Buka Gimp, dari menu Edit -> Preferences ->  Windows Management. Pada kolom Hint for the toolbox dan Hint for the docks pastikan isinya Utility window (sebenernya ini udah seting default Gimp).

Selanjutnya ada 2 cara untuk menyembunyikan Utility window tersebut. Cara 1 saya dapat dari https://bugzilla.redhat.com/show_bug.cgi?id=466622, yaitu dengan cara :

Buka konsole, ketikkan (mending kopi paste) :

1. 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]
2. gconftool-2 -s /apps/compiz/plugins/winrules/screen0/options/skiptaskbar_match --type string "type=Utility"

Cara ke-2, menggunakan CompizConfig Setting Manager, yaitu :

1. System -> Preferences -> CompizConfig Setting Manager -> Window Management
2. Aktifkan Window Rules (dicentangin)

   

3. Pada kolom Skip taskbar (paling atas mas), tuliskan : type=Utility
   
4. Tutup CompizConfig Setting Manager

Selesai mas, sekarang coba buka Gimpnya.

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