[geary/wip/795595-fix-special-folder-creation: 2/6] Simplify the process of creating new local folders somewhat

[Michael Gratton <mjog src gnome org>]

commit b4749cce393c7b2ce508a68d4a8ecae66d21341e
Author: Michael Gratton <mike vee net>
Date:   Tue Sep 25 23:59:28 2018 +1000

    Simplify the process of creating new local folders somewhat
    
    Enable local folders to be created with one call, rather than two.

 src/engine/imap-db/imap-db-account.vala            | 12 ++++++----
 .../imap-engine/imap-engine-generic-account.vala   | 26 ++++++++--------------
 2 files changed, 17 insertions(+), 21 deletions(-)
---
diff --git a/src/engine/imap-db/imap-db-account.vala b/src/engine/imap-db/imap-db-account.vala
index d0f6f277..28de8efc 100644
--- a/src/engine/imap-db/imap-db-account.vala
+++ b/src/engine/imap-db/imap-db-account.vala
@@ -384,9 +384,10 @@ private class Geary.ImapDB.Account : BaseObject {
     private void on_outbox_email_sent(Geary.RFC822.Message rfc822) {
         email_sent(rfc822);
     }
-    
-    public async void clone_folder_async(Geary.Imap.Folder imap_folder, Cancellable? cancellable = null)
-        throws Error {
+
+    public async Folder clone_folder_async(Geary.Imap.Folder imap_folder,
+                                           GLib.Cancellable? cancellable = null)
+        throws GLib.Error {
         check_open();
 
         Geary.Imap.FolderProperties properties = imap_folder.properties;
@@ -426,8 +427,11 @@ private class Geary.ImapDB.Account : BaseObject {
             
             return Db.TransactionOutcome.COMMIT;
         }, cancellable);
+
+        // XXX can't we create this from the INSERT above?
+        return yield fetch_folder_async(path, cancellable);
     }
-    
+
     public async void delete_folder_async(Geary.Folder folder, Cancellable? cancellable)
         throws Error {
         check_open();
diff --git a/src/engine/imap-engine/imap-engine-generic-account.vala 
b/src/engine/imap-engine/imap-engine-generic-account.vala
index f90f3e05..6e7ec146 100644
--- a/src/engine/imap-engine/imap-engine-generic-account.vala
+++ b/src/engine/imap-engine/imap-engine-generic-account.vala
@@ -1240,27 +1240,19 @@ internal class Geary.ImapEngine.UpdateRemoteFolders : AccountOperation {
             .map<Geary.Folder>(e => (Geary.Folder) e.value)
             .to_array_list();
 
-        // For folders to add, clone them and their properties locally
+        // For folders to add, clone them and their properties
+        // locally, then add to the account
         ImapDB.Account local = ((GenericAccount) this.account).local;
-        foreach (Geary.Imap.Folder remote_folder in to_add) {
-            try {
-                yield local.clone_folder_async(remote_folder, cancellable);
-            } catch (Error err) {
-                debug("Unable to add/remove folder %s to local store: %s", remote_folder.path.to_string(),
-                    err.message);
-            }
-        }
-
-        // Create Geary.Folder objects for all added folders
         Gee.ArrayList<ImapDB.Folder> to_build = new Gee.ArrayList<ImapDB.Folder>();
         foreach (Geary.Imap.Folder remote_folder in to_add) {
             try {
-                to_build.add(yield local.fetch_folder_async(remote_folder.path, cancellable));
-            } catch (Error convert_err) {
-                // This isn't fatal, but irksome ... in the future, when local folders are
-                // removed, it's possible for one to disappear between cloning it and fetching
-                // it
-                debug("Unable to fetch local folder after cloning: %s", convert_err.message);
+                to_build.add(
+                    yield local.clone_folder_async(remote_folder, cancellable)
+                );
+            } catch (Error err) {
+                debug("Unable to clone folder %s in local store: %s",
+                      remote_folder.path.to_string(),
+                      err.message);
             }
         }
         this.generic_account.add_folders(to_build, false);