Fix a defect in the Save/Cancel buttons in Edit mode
that was causing the first click to be missed; this
was due to Angular's inability to detect when a
native promise (as opposed to one from ) had been
resolved.
Since the Editor capability is introduced indirectly
and is a few degrees of separation removed from
the declared extension layer (where we would be able
to get a reference to ), and all we need to do is
make something look Promise-like, a convenience
function to do this is added.
Part of ongoing transition of common user interface
elements, WTD-574.
