editing_style: :delete is broken starting with v2.3.1

[wallclimber21]

Hello Promotion crew,

It looks like the editing_style: :delete option is broken in the current Promotion release (v2.3.1).

I'm simply testing it by changing the app_delegate in the main repo to use TestTableScreen instead of BasicScreen, and deletable rows just don't react at all when you swipe left.

v2.3.0 works fine when left sliding the 'Just another deletable blank work'.
v2.3.1 doesn't do anything at all.

I've isolated the issue to commit f88864f.

It looks like the self.extend either doesn't work when running as a real app, yet the spec test seems to be fine. Weird.

Tom

[markrickert]

Thanks for the detective work! I'll take a look at this today.

[markrickert]

Discussion is going on on #653