Code review comment for lp:~bertrand-rousseau/gtg/bugfix-1038662-dont-touch-due-date

I've tested and I see a problem :

1. Set the parent due date to "soon"

2. Open the children and set due date to "now".

Everything is fine.

3. Now set child due date to "later": immediately, the parent due date is changed too.

Is that what we really want ?