Copy and pasting content into Customer Portal on IE11 and Firefox removes line breaks

Summary

This seems to be a minor regression of JRASERVER-42902. Copy & paste content from Notepad/Word removes line breaks only on Customer Portal. If we do the same in JIRA view, the line breaks are preserved.

Steps to Reproduce

1. Open IE11 or Firefox.
2. Access one of the Service Desk issue on Customer Portal.
3. Copy & paste the following content to Notepad:

   line one
   line two
   line three
   

4. Then copy & paste the content from Notepad into the comment section of the Service Desk issue.

Expected Results

The content suppose to be:

line one
line two
line three

Actual Results

The content will be:

line oneline twoline three

Note

This is also affecting users that open Support tickets on https://getsupport.atlassian.com on IE11/Firefox browser. If you encounter such behaviour, please use the workaround below.

Workaround

1. Instead of using Ctrl+V, please use Right-click on mouse - Paste.
2. Use a different browser like Chrome