1. Create a polygon
2. Set the polygon fill
3. Set the line to None
Line still shows, you need to change the polygon or move it for the line to be removed.
I confirm you have to move the polygon, if you change the style to None in the sidebar.
It works immediately, if you do it through More options.
Win 7 64-bit Version: 220.127.116.11.alpha1+
Build ID: 56019dcb79475606952a954fe732a3109441ffec
TinderBox: Win-x86@39, Branch:master, Time: 2014-10-30_07:27:11
Can't reproduce anymore ...
Yep, tested and WFM.
Win 7 Pro 64-bit Version: 18.104.22.168.alpha1+
Build ID: 5fc0cbbc1254223fedf0f78c5e7539219b228697
TinderBox: Win-x86@39, Branch:master, Time: 2015-06-11_04:30:51
Locale: fi-FI (fi_FI)