Data filled out on Forms is lost when user session expires

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, 7.3.X, Master
• Fix Version/s: 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Forms
• Labels:
  • 7.4-known-issues
  • forms_customer_demand
  • liferay-ga1-ce-740
  • liferay-ga2-ce-741
• Fix Priority: 4
• Sprint: Forms_7.4_16, Forms_7.4_17, Forms_7.4_18, Forms_7.4_19
• Git Pull Request: https://github.com/natocesarrego/liferay-portal/pull/1083

Steps to reproduce

1. Go to Content & Data > Forms
2. Add a new Form
3. Add a Text field
4. Publish the Form
5. Fill out the Text field with any text
6. Wait user session expire. You'll be notified about it on the left bottom side of the UI. ( Tip: reduce the session timeout to 1 minute to make easier the issue reproduction. You can update the session timeout through the parameter <session-timeout> available on the file tomcat-9.0.37/webapps/ROOT/WEB-INF/web.xml. )
7. Submit the Form

Note: It can also be reproduced when filling out the form as Guest.

Expected result
Forms should redirect the user to the login screen, display a message informing his session has expired and once the user logs into portal, get back to the form with the latest draft loaded on Forms.
As a Guest, Forms must reload the page when submitting in an expired session.

Actual result
A blank screen is displayed and the user doesn't know what happened with the inputted data.