[geary/mjog/db-result-timing] Geary.ImapDB.Folder: Drop create/merge batch size down

[Michael Gratton <mjog src gnome org>]

commit 3d8b86dd4e46939dc1a839873a2d049d650d0491
Author: Michael Gratton <mike vee net>
Date:   Sat Sep 12 12:02:49 2020 +1000

    Geary.ImapDB.Folder: Drop create/merge batch size down
    
    We've had reports on Matrix that existing batch transactions in
    `create_or_merge_email_async` are taking up to 30s to run, which is
    getting uncomfortably close to the 60s timeout.
    
    Drop the batch size down from 25 to 10 to reduce the chance that this
    will eventually fail with a "database is locked" error.
    
    See #921 for context.

 src/engine/imap-db/imap-db-folder.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/engine/imap-db/imap-db-folder.vala b/src/engine/imap-db/imap-db-folder.vala
index 4b015cd17..2c2d4015b 100644
--- a/src/engine/imap-db/imap-db-folder.vala
+++ b/src/engine/imap-db/imap-db-folder.vala
@@ -40,7 +40,7 @@ private class Geary.ImapDB.Folder : BaseObject, Geary.ReferenceSemantics {
     private const int LIST_EMAIL_METADATA_COUNT = 100;
     private const int LIST_EMAIL_FIELDS_CHUNK_COUNT = 500;
     private const int REMOVE_COMPLETE_LOCATIONS_CHUNK_COUNT = 500;
-    private const int CREATE_MERGE_EMAIL_CHUNK_COUNT = 25;
+    private const int CREATE_MERGE_EMAIL_CHUNK_COUNT = 10;
     private const int OLD_MSG_DETACH_BATCH_SIZE = 1000;
 
     // When old messages beyond the period set in the account preferences are removed this number