6.4.3-rc2 (#1193)

- Don't show spurious "new message" notifications for outgoing media
files
- Make sure to open the receiver's chat when sharing via sharesheet
- Fix hang on startup
- Fix SASL2 upgrade path for servers using LDAP as auth backend

Monal/Classes/DataLayerMigrations.m

@@ -1083,7 +1083,7 @@ FOREIGN KEY('account_id') REFERENCES 'account'('account_id') ON DELETE CASCADE \
         //reactivate PLAIN auth on all accounts to allow proper upgrades to servers only supporting PLAIN even with SASL2
         //this should fix issue #1186
         [self updateDB:db withDataLayer:dataLayer toVersion:6.405 withBlock:^{
-            [db executeNonQuery:@"UPDATE account SET plain_activated=true, supports_sasl2=false;"];
+            [db executeNonQuery:@"UPDATE account SET plain_activated=true WHERE supports_sasl2=false;"];
         }];
 
         //streamlined code with only plain_activated column