[[!comment format=mdwn
 username="joey"
 subject="""comment 1"""
 date="2015-04-29T16:49:22Z"
 content="""
You forgot to say what version of dolphin you are having trouble with.
I've tested it working with version 4.14.2.

I don't understand what the "command_string_is_ignored" in your example
is supposed to do, or why you'd not want to quote the filename.
"""]]