Emergency patch to fix issue introduced in the svg core of Firefox as they are moving forward with implementing features of SVG 2

See this issue in svg-edit project tracker:  Issue 1081.

It contains pointers to the bugzilla thread if you are so interested


git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2509 eee81c28-f429-11dd-99c0-75d572ba1ddd