[geary] (36 commits) ...Merge branch 'wip/conversation-polish' into 'master'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  a4af3a0... Fix uncaught error build warning (*)
  98c17dd... Add some doc comments to Geary.Email (*)
  b23ff03... Fix ConversationEmail.email having no flags after message l (*)
  46ebfa3... Display loading indicator for long-running local Conversati (*)
  43080b8... Replace pair of ConversationEmail body load state bools wit (*)
  11eff59... Fix incorrect images in ConversationViewer placeholders (*)
  b9942ca... Retry fetching remote email body when loading but command t (*)
  43a0ef2... Make ConversationEmail and ConversationMessage coordinate p (*)
  2769373... Handle being offline when loading email bodies for display (*)
  ee8383a... Show a placeholder when an email body was not able to be lo (*)
  afe09c3... Wrap the placeholder pane's subtitle automatically (*)
  4c9c387... Fix offline status with multiple accounts (*)
  a46539c... Make Geary.ClientService debug logging more useful (*)
  3ca319e... Fix email remote loaded by FetchEmail replay op not having  (*)
  5fea5c8... Modernise FetchOperation somewhat (*)
  8bb07c5... Ensure Imap.ClientConnection also notifies of status respon (*)
  98be2d1... Make ImapCommand throw a timeout error when a timeout has o (*)
  87b2555... Don't use catch in finally clauses due to Vala bug (*)
  6b9e08b... Fix units in calculating next check in ConnectivityManager (*)
  207a3ed... Kick off periodic checks in ConnectivityManager to discover (*)
  1a845dc... Handle connectivity check errors for local remote endpoints (*)
  32602ba... Refine auto-mark-read to only happen as a direct result of  (*)
  4a9baaa... Further refine email body loading progress feedback (*)
  9420334... Don't try re-downloading email bodies on time-out (*)
  b5e5a22... Remove uused ClientWebView.has_valid_height property (*)
  7bc878e... Remove obsolete comment (*)
  eef1e09... Don't bother queuing resizs for conversation messages when  (*)
  f0418d0... Rework sending ClientWebView sending preferred height from  (*)
  4c7d98a... Unb0rk use of iterator API (*)
  4c55e79... Include preview in Geary.Email.MUTABLE_FIELDS (*)
  8e4cfdb... Tidy up ConversationListStore's preview flags (*)
  2725d3d... Trivial code formatting cleanup (*)
  f223564... Show a problem report when an error occurs loading a messag (*)
  c64eb72... Display a placeholder when email body loading is taking a l (*)
  8d17354... Tidy up placeholder style when it has no text (*)
  4b3c167... Merge branch 'wip/conversation-polish' into 'master'

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