I'd like to land this for 1.2 if there are no issues in our test suite. If things get complex, we can push this to 1.3.
This is the version to use:
Would be good to have this done before 1.9 final, in case any change since 1.9m7 turns out to be problematic.
Upgrade widget factory to 1.9 beta version - FIxes #4629