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[Mahara Bot <1804328@xxxxxxxxxxxxxxxxxx>]

Patch for "18.04_STABLE" branch: https://reviews.mahara.org/9328

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https://bugs.launchpad.net/bugs/1804328

Title:
  need to clean html tag classes in comments

Status in Mahara:
  Fix Committed
Status in Mahara 18.04 series:
  Fix Committed
Status in Mahara 18.10 series:
  Fix Committed
Status in Mahara 19.04 series:
  Fix Committed

Bug description:
  When adding a comment, the text can include html tags with classes
  that might interfere with the styling classes used by core. This could
  break the functionality of the page.

  To replicate

  - create a page and display it
  - at the bottom, in the comment text area, expand the toolbar
  - click on the 'Source code' button and add the text:

  <div class="post list-group-item clearfix flush">
  <div id="user_feedbacktable_0123456789" class="feedback modal modal-docked active">
  <div class="modal-dialog modal-lg">
  <div class="modal-content">
  <div class="modal-body flush">
  <div class="list-group list-group-lite">
  <div id="user_comment12345" class="comment-item list-group-item list-group-item-warning r0">
  <div class="comment-text">
  <div class="comment-content">
  <p>Comment text.</p>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
  <div class="post list-group-item clearfix flush"> </div></div>

  Expected result:
  - The page refreshes and the text "Comment text." is displayed

  Actual result:
  - The comment is not displayed

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