Message Board Reply button is not disabled when replying to thread

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.3.7 CE GA8, 7.3.10 DXP FP2, 7.3.X, 7.4.0 CE GA1, Master
• Component/s: Message Boards
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-2-7310
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-lima/liferay-portal/pull/1690

Steps to Reproduce

1. Add a Message Boards widget to the page
2. Add a new thread
3. Click the "Reply" button

Expected Results
The "Reply" button is disabled. (Taken from https://issues.liferay.com/browse/LPS-112157?focusedCommentId=2138047&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2138047)

Actual Results
The "Reply" button remains enabled and clicking it erases all text inputted.