Don't make a new previewer widget each time
Don't make a new previewer widget each time

There's some cost to making a new previewer widget, and it was
writting so it could be reused rather that made from scratch each
time. Keeping around a preview widget will be more efficient.
[endlessm/eos-sdk#1617]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib