DraftStore
Summary
DraftStore responds to Actions that interact with Drafts and exposes public getter methods to return Draft objects and sessions.
It also creates and queues {Task} objects to persist changes to the Mailspring API.
Remember that a "Draft" is actually just a "Message" with draft: true.
Instance Methods
isSendingDraft()
Look up the sending state of the given draftClientId. In popout windows the existance of the window is the sending state.