[geary] (20 commits) Created branch mjog/493-undo-send

[Michael Gratton <mjog src gnome org>]

The branch 'mjog/493-undo-send' was created.

Summary of new commits:

  f702b29... Rename Config class and source file to match code style
  9098d92... Let Application.Command instances specify if they support r
  b66cad1... Util.Email.to_short_recipient_display: Consider all of to/c
  4f39d63... Make Geary.ComposedEmail implement Geary.EmailHeaderSet
  73b17b0... Replace Geary.Account::send_email w/ Smtp.ClientService met
  8ea19d2... Minimise DOM changes made by ComposerPageState::cleanConten
  fbfab0c... Move composer classes into their own namespace
  b289190... Clean up the Composer API
  e0699a3... Clean up Composer.Widget header management
  54a7e8e... Clean up how Composer.Widget's presentation mode is updated
  b4361f4... Rework Composer.Widget close management
  b8f4687... Minor Application.Controller shutdown cleanup
  bcbe323... Add undo-send-delay application setting
  cdbc1ff... Implement undo-on-send
  c3446e7... Update composer draft lifecycle management
  a25f194... Make Application.Controller's composer command re-usable
  af19cad... Implement undoing discarded composers
  b92d60f... Implement undoing saved composers
  fc3b4ad... Don't prompt when closing in-main-window composers
  ffdb1a0... Ensure saved drafts are reused when reusing Composer.Widget