cannot set icon for recoll window

Hi everyone,

strange problem here :

xprop outputs for recoll window :
WM_CLASS(STRING) = "recoll", "Recoll"

but, when I set in ~/.icewm/winoptions or /usr/share/icewm/winoptions :

recoll.icon: /usr/share/icons/hicolor/48x48/apps/recoll.png
or
Recoll.icon: /usr/share/icons/hicolor/48x48/apps/recoll.png
or
recoll.Recoll.icon: /usr/share/icons/hicolor/48x48/apps/recoll.png

nothing happens, still the red X as icon for recoll window.
As a test, I replaced in winoptions recoll.icon by zim.icon : it works, 
zim gets /usr/share/icons/hicolor/48x48/apps/recoll.png as icon.
So it looks like icewm as some problem recognizing name and class only 
for recoll window.
Any idea how to solve it ?
Thanks,

Denis

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