[geary/mjog/prefer-special-use] imap: Ignore UIDNEXT 0 values sent from servers

[Michael Gratton <mjog src gnome org>]

commit 0e5fed4bf5109bddd0393bea39a542167931f4c3
Author: Michael Gratton <mike vee net>
Date:   Wed Mar 18 23:59:35 2020 +1100

    imap: Ignore UIDNEXT 0 values sent from servers
    
    Some mail servers e.g hMailServer and whatever is used by home.pl
    (dovecot?) sends UIDNEXT 0. Just ignore these since there nothing else
    that can be done.
    
    See #711

 src/engine/imap/api/imap-folder-session.vala   | 15 ++++++++++++++-
 src/engine/imap/response/imap-status-data.vala | 21 ++++++++++++++++++---
 2 files changed, 32 insertions(+), 4 deletions(-)
---
diff --git a/src/engine/imap/api/imap-folder-session.vala b/src/engine/imap/api/imap-folder-session.vala
index c94da4bc..e83f2f50 100644
--- a/src/engine/imap/api/imap-folder-session.vala
+++ b/src/engine/imap/api/imap-folder-session.vala
@@ -253,7 +253,20 @@ private class Geary.Imap.FolderSession : Geary.Imap.SessionObject {
                 break;
 
                 case ResponseCodeType.UIDNEXT:
-                    this.folder.properties.uid_next = response_code.get_uid_next();
+                    try {
+                        this.folder.properties.uid_next = response_code.get_uid_next();
+                    } catch (ImapError.INVALID err) {
+                        // Some mail servers e.g hMailServer and
+                        // whatever is used by home.pl (dovecot?)
+                        // sends UIDNEXT 0. Just ignore these since
+                        // there nothing else that can be done. See
+                        // GNOME/geary#711
+                        if (response_code.get_as_string(1).as_int64() == 0) {
+                            warning("Ignoring bad UIDNEXT 0 from server");
+                        } else {
+                            throw err;
+                        }
+                    }
                 break;
 
                 case ResponseCodeType.UIDVALIDITY:
diff --git a/src/engine/imap/response/imap-status-data.vala b/src/engine/imap/response/imap-status-data.vala
index 9c1786e9..40d897f9 100644
--- a/src/engine/imap/response/imap-status-data.vala
+++ b/src/engine/imap/response/imap-status-data.vala
@@ -101,7 +101,20 @@ public class Geary.Imap.StatusData : Object {
                     break;
 
                     case StatusDataType.UIDNEXT:
-                        uid_next = new UID.checked(valuep.as_int64());
+                        try {
+                            uid_next = new UID.checked(valuep.as_int64());
+                        } catch (ImapError.INVALID err) {
+                            // Some mail servers e.g hMailServer and
+                            // whatever is used by home.pl (dovecot?)
+                            // sends UIDNEXT 0. Just ignore these
+                            // since there nothing else that can be
+                            // done. See GNOME/geary#711
+                            if (valuep.as_int64() == 0) {
+                                warning("Ignoring bad UIDNEXT 0 from server");
+                            } else {
+                                throw err;
+                            }
+                        }
                     break;
 
                     case StatusDataType.UIDVALIDITY:
@@ -118,8 +131,10 @@ public class Geary.Imap.StatusData : Object {
                     break;
                 }
             } catch (ImapError ierr) {
-                message("Bad value at %d/%d in STATUS response \"%s\": %s", ctr, ctr + 1,
-                    server_data.to_string(), ierr.message);
+                warning(
+                    "Bad value at %d/%d in STATUS response \"%s\": %s",
+                    ctr, ctr + 1, server_data.to_string(), ierr.message
+                );
             }
         }