fix(mail): split "l" and "r" ACL attributes for IMAP mailboxes

Fixes #4983

SoObjects/Mailer/SOGoMailFolder.m

@@ -1326,6 +1326,8 @@ static NSComparisonResult _compareFetchResultsByUID (id entry1, id entry2, NSArr
       switch ([imapAcls characterAtIndex: count])
 	{
 	case 'l':
+	  [SOGoAcls addObjectUniquely: SOGoRole_FolderViewer];
+          break;
 	case 'r':
 	  [SOGoAcls addObjectUniquely: SOGoRole_ObjectViewer];
 	  break;
@@ -1408,11 +1410,10 @@ static NSComparisonResult _compareFetchResultsByUID (id entry1, id entry2, NSArr
   acls = [sogoAcls objectEnumerator];
   while ((currentAcl = [acls nextObject]))
     {
-      if ([currentAcl isEqualToString: SOGoRole_ObjectViewer])
-	{
-	  [imapAcls appendFormat: @"lr"];
-	  character = 0;
-	}
+      if ([currentAcl isEqualToString: SOGoRole_FolderViewer])
+	character = 'l';
+      else if ([currentAcl isEqualToString: SOGoRole_ObjectViewer])
+	character = 'r';
       else if ([currentAcl isEqualToString: SOGoMailRole_SeenKeeper])
 	character = 's';
       else if ([currentAcl isEqualToString: SOGoMailRole_Writer])

SoObjects/SOGo/SOGoPermissions.h

@@ -1,8 +1,6 @@
 /* SOGoPermissions.h - this file is part of SOGo
  *
- * Copyright (C) 2006 Inverse inc.
- *
- * Author: Wolfgang Sourdeau <wsourdeau@inverse.ca>
+ * Copyright (C) 2006-2021 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

SoObjects/SOGo/SOGoPermissions.m

@@ -1,6 +1,6 @@
 /* SOGoPermissions.m - this file is part of SOGo
  *
- * Copyright (C) 2006-2014 Inverse inc.
+ * Copyright (C) 2006-2021 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -28,6 +28,7 @@ NSString *SOGoRole_ObjectEditor = @"ObjectEditor";
 
 NSString *SOGoRole_FolderCreator = @"FolderCreator";
 NSString *SOGoRole_FolderEraser = @"FolderEraser";
+NSString *SOGoRole_FolderViewer = @"FolderViewer";
 
 NSString *SOGoRole_AuthorizedSubscriber = @"AuthorizedSubscriber";
 NSString *SOGoRole_PublicUser = @"PublicUser";