date_ical_parse unfolds lines wrong on certain calendars

I have a site that is importing multiple calendars that are either managed through iCal or Thunderbird's Lightning calendar plugin. The problem I'm seeing I believe is associated with this recent update's new line found in ../date/date_api_ical.inc line 151

$line = array_pop($icaldata) . (ltrim(substr($line, 0, 1)) . substr($line, 1));

What happens are line breaks occur in strange places and single spaces are being inserted between words in body text of events imported from Lightning calendars and NOT from iCal calendars. When I reverted this line back to how it was in version 6.x-2.8

$line = array_pop($icaldata) . ($line);

the problem goes away.

I'm not familiar with the reason this line was altered, but does it need to be. Is it just something that Thunderbird needs to change on it's end and not on Drupal's end? Just wanting to bring attention to this issue and get some sort of advice or explanation.

Thanks