[geary] (48 commits) ...Merge branch 'mjog/account-command-stacks' into 'mainline'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  09f6fc0... Improve Geary.Account API for listing folders (*)
  8e9f002... Move GAction related code from app Controller to MainWindow (*)
  88eb8f5... Implement an application-level command stack (*)
  d1d8bed... Implement main toolbar composer actions (*)
  66668a7... Move per-message action handlers from Controller to MainWin (*)
  27d3fb6... ConversationList: Minor selection-related perf tweak (*)
  95b819f... Application.Controller: Make context class publically acces (*)
  24c12a2... Move conversation selection and action updates to main wind (*)
  17ddb45... Allow Command instances to denote whether they support undo (*)
  d8a8640... Implement conversation flag updating as undoable commands (*)
  0132981... Implement moving conversations as undoable commands (*)
  3c06ddf... Implement copying conversations as a command (*)
  df780d7... Implement deleting conversations as non-undoable commands (*)
  0871039... Implement emptying spam/trash as non-undoable commands (*)
  19b1382... Minor code style and doc comment update (*)
  fe67993... Clean up MainWindow action definitions (*)
  ebc14c4... Don't initially notify on mark email commands (*)
  954f7fc... Rename MainWindow::current_account and ::current_folder pro (*)
  12e73b3... Remove Application.Controller::current_account (*)
  227b68e... Make Application.Controller commands per-account (*)
  2acd7d6... Allow CommandStack subclasses to access the undo stack (*)
  5f3a162... Add status signals to Application.Command (*)
  a8849c9... Update Application.CommandSequence (*)
  84fd4eb... Trim controller command stack when exogenous events occur (*)
  a282dc5... Use Geary.FolderSupport.Archive when moving to archive spec (*)
  b4d3c60... Merge Controller.move_conversations and move_messages impls (*)
  50749d9... Trivial translation comment cleanup (*)
  bcce3a3... Make GearyApplication::show_uri handle mailto: URIs (*)
  de6ef69... Clean up attachment save code (*)
  7be9115... Rename client GtkUtil package to conform to style: Util.Gtk (*)
  01fc1ab... Move View Source implementation to ConversationEmail (*)
  5312241... Remove ConversationEmail::load_error (*)
  ce86e3a... Move policy decision for folders supporting trash to contro (*)
  f9cf70c... Fix MainWindow shift button detection (*)
  5cc92ef... Move email action handling to ConversationListBox (*)
  acc243c... Fix some bad container impl assumptions in MinimalFolder (*)
  358d864... Add location and conversation context properties to EmailCo (*)
  c601be4... Prevent the same application action re-executed multiple ti (*)
  3fb943c... Move folder selection and related handling to MainWindow (*)
  09fde27... Require MainWindow::select_folder to declare mode of intera (*)
  ac0c015... Application.Controller: Add convenience method (*)
  4adacb4... Move MainWindow folder management impl to MainWindow (*)
  800e53b... Improve application shutdown process (*)
  c002285... Geary.App.ConversationMonitor: Fix re-entrancy issues (*)
  2d47e48... Re-select folder, conversation and email on EmailCommand un (*)
  e564ab4... ConversationListView: Remove some unused code (*)
  353955f... Update appstream to mention improved undo support (*)
  a39601f... Merge branch 'mjog/account-command-stacks' into 'mainline'

(*) This commit already existed in another branch; no separate mail sent