[orca] Add missing roles to chunk predicate

[Joanmarie Diggs <joanied src gnome org>]

commit 90b84e44548748acedf5434a5cfa35bb4ebb8acc
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Tue Aug 13 11:52:44 2019 -0400

    Add missing roles to chunk predicate

 src/orca/structural_navigation.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/structural_navigation.py b/src/orca/structural_navigation.py
index bca40be5e..481b45485 100644
--- a/src/orca/structural_navigation.py
+++ b/src/orca/structural_navigation.py
@@ -1682,7 +1682,7 @@ class StructuralNavigation:
             return False
 
         role = obj.getRole()
-        if role not in self.OBJECT_ROLES:
+        if role not in self.OBJECT_ROLES + self.CONTAINER_ROLES:
             return False
 
         if role in [pyatspi.ROLE_ARTICLE, pyatspi.ROLE_HEADING]: