Fix Issue 87 via Alexis' patch: remove poly artifacts when switching mode in mid-creation of poly
Fix Issue 87 via Alexis' patch: remove poly artifacts when switching mode in mid-creation of poly

git-svn-id: 829f041edcabe93b7893c4ec42f5993156d1fcf0@378 eee81c28-f429-11dd-99c0-75d572ba1ddd

kenwenzel/svg-edit,kenwenzel/svg-edit,kenwenzel/svg-edit