JQL: Auto complete does n't work if query contains nested parenthesis

This query is written as anonymous user
Steps:
1. Launch JIRA.
2. Suppose user wants to write a query like ((issuetype in (bug, "High priority feature", Improvement) or project="Browse Project" )) and ((reporter = veenu) and (assignee =veenu))
3. After closing the first set of query using )), try to use auto complete.

Result:
1. Auto complete for JQL stop working for further query once the query statement has double closing parenthesis.
2. In the above example ((issuetype in (bug, "High priority feature", Improvement) or project="Browse Project" )), user will not able to use autocomplete.

Expected:
1. User should be able to use Auto complete.