[geary/wip/778276-better-flag-updates: 13/17] Increase the remote folder refresh interval.

[Michael Gratton <mjog src gnome org>]

commit 986a095c483adcb425abb68e501b80e06811e419
Author: Michael James Gratton <mike vee net>
Date:   Tue Nov 28 10:24:46 2017 +1100

    Increase the remote folder refresh interval.
    
    Now we are getting notified of folder chnages, we can sweep for folder
    changes less often.
    
    * src/engine/imap-engine/imap-engine-generic-account.vala
      (GenericAccount): Bump remote folder refresh interval from 2 minutes to
      15 minutes.

 .../imap-engine/imap-engine-generic-account.vala   |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/engine/imap-engine/imap-engine-generic-account.vala 
b/src/engine/imap-engine/imap-engine-generic-account.vala
index 7635ad2..a6a7b71 100644
--- a/src/engine/imap-engine/imap-engine-generic-account.vala
+++ b/src/engine/imap-engine/imap-engine-generic-account.vala
@@ -8,7 +8,11 @@
 
 private abstract class Geary.ImapEngine.GenericAccount : Geary.Account {
 
-    private const int REFRESH_FOLDER_LIST_SEC = 2 * 60;
+    // This is high since it's an expensive operation, and we'll go
+    // looking changes caused by local operations as they happen, so
+    // we don't need to double check.
+    private const int REFRESH_FOLDER_LIST_SEC = 15 * 60;
+
     private const Geary.SpecialFolderType[] SUPPORTED_SPECIAL_FOLDERS = {
         Geary.SpecialFolderType.DRAFTS,
         Geary.SpecialFolderType.SENT,