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,
Package: freeplane
Version: 1.2.23-2
Severity: minor
Dear Maintainer,
When I start Freeplane the icon that appears on main and left panel is wrong.
There are also two different icons on the left panel under the 'Activities'
menu when is set as prefered program. One is the normal icon, the other
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