Draw From Triangle: Common objects disappeared in live preview while turning on and off some objects many times
In Draw From Triangle extension, while turning on and off some common objects many times with live preview, all common objects disappeared and cannot apply anymore.
Steps to reproduce:
1) Draw a triangle by path tool.
2) Call Draw From Triangle extension.
3) Turn on the live preview mode and turn on and off some common objects many times.
All previewed objects disappeared (If you are (un)lucky) and cannot preview and apply anymore after that.
Inkscape version: trunk-r22256
Build & Platform: Build 2009-09-19 on Arch Linux (x86_64)
SVG file, gdb log and xsession-errors (Note: While taking these logs, this issue occurred **3 times**)