Calc showing / hiding Comments

Hi,

I had the idea some time that it should be quite easy to make the menu 
to hide / show comments in a Calc cell, to work over a range, not per 
single cell only.

 see https://bugs.freedesktop.org/show_bug.cgi?id=39454#c5

Found the code, but turns out to be a little less easy ;-)

Nonetheless, I've some idea's and would like to ask few eyes to look at 
those, before doing further work on that.

Post my ideas/notes here?

thanks,
--
 - Cor
 - http://nl.libreoffice.org
 - www.librelex.org