Mentions list does not disappear after clearing out all characters with backspace/delete keys

After mentioning the @mention list does not go away even when text is fully cleared with backspace/delete key.

The problem is in this file -
modules/contrib/ckeditor_mentions/js/plugins/mentions/plugin.js -

The only keys accepted to clear mention list are -
['Enter', 'ArrowLeft', 'ArrowUp', 'ArrowRight', 'ArrowDown', 'Delete', 'Home'], line 155 -

function breakCheck(key) {
        var special = ['Enter', 'ArrowLeft', 'ArrowUp', 'ArrowRight', 'ArrowDown', 'Delete', 'Home'];
        for (var i = 0; i < special.length; i++) {
          if (special[i] === key) {
            return true;
          }
        }
        return false;
}

If we add the backspace key to above array, this will cause another issue. The moment backspace key is hit, the list will go away, even though there are still chars left after the "@" and it should show the list accordingly.

For this, there is code at line 57 -

if (key === 'Backspace') {
              // If backspacing during a selection pop the last item in the array out.
              editorInstance.replacementChars.pop();

We need to add code to this block with the logic that list should get cleared if the array "editorInstance.replacementChars" becomes empty.