store and disabled child-node

[Whateverman2012]

Hi,
First, thank you for you work.

It seems to be the most useful tree I found lately.

Here is the weird behavior I met.

When linked to a store, a node with a disabled child node being checked hangs the browser.
No store, no stall.

Here is the code.

Step:
Expand "The Good Parts" to see the disabled node "LOOSE TYPING"
Check "The Good Parts".
Then my fans start spinning...

https://jsfiddle.net/s38f2vL5/

Regards