[Suggestion] - set Draper::ViewContext explicitly

[antulik]

Right now there are many issues due to Draper::ViewContext inflexibility

I would like to suggest to explicitly set Draper::ViewContext, rather than rely on RequestStore

For example

# helper method definition
def draper_context
  old_value = Draper::ViewContext.current
  Draper::ViewContext.current = self
  yield
ensure
  Draper::ViewContext.current = old_value
end

# somewhere, e.g. in controller
draper_context do
   decorated_posts = posts.decorate
end

Note: right now that won't work as decorated object does not remember context when it was created

Ultimately decorates_assigned would be switch to this helper as well as every other use of draper, so that solution with RequestStore could be deprecated and removed.

What do you think?