Bug#727059: freeplane: Wrong icon appears on GNOME 3 main and left panels

[Felix Natter]

hi Alessio,

from the link you posted:
  http://askubuntu.com/questions/36434/how-can-i-remove-duplicate-icons-for-launched-java-programs-in-the-launcher

# run this, then select the freeplane window:
$ xprop | grep WM_CLASS

# on my system:
WM_CLASS(STRING) = "sun-awt-X11-XFramePeer", "java-lang-Thread"

=> have you tried to modify: 
 
  /usr/share/applications/freeplane.desktop

to add a line:

StartupWMClass=sun-awt-X11-XFramePeer
or
StartupWMClass=java-lang-Thread

and logout+login?

Best Regards!
-- 
Felix Natter