Adding comments with backslashes in the customer portal makes the backslashes duplicated

Issue Summary

Adding comments containing backslashes causes the comments to not be rendered correctly in the old issue view

Steps to Reproduce

1. Connect to the customer portal and create an issue.
2. Add the comment using backslashes as the one below:

   \\Program Files\Company\Software
   

Expected Results

The comment should be displayed like the one below:

\\Program Files\Company\Software

Actual Results

\\\\Program Files\\Company
 Software

The backslashes are duplicating and there is a class "alt-forced-newline" that is breaking the commend in two lines.

As of 5.15/9.15

The behaviour has changed slightly and now matches the internal Agent Jira experience.

However, the initial double backslash is now being converted to a newline.

Program Files\Company\Software

Workaround

By using the code snippet in the customer portal the backslashes aren't duplicating.