canvas.loadFromJSON fails when event listeners add more objects

[forrert]

My canvas has an event listeners registered creating additional objects, when certain objects are added to the canvas. This causes problems, when I am trying to load objects into the canvas from a JSON object. Some of the objects from the JSON get lost in the process.

JS Fiddle here: https://jsfiddle.net/64spd9vx/2/

I have been able to narrow the bug down to this line: https://github.com/kangax/fabric.js/blob/master/dist/fabric.require.js#L5331

Changing the last parameter from true to false solves this issue. I could create a PR, but would appreciate feedback or comments from experienced contributors. Do you see any issues in changing the parameter?