Fix misidentification of indented comments #6617
                
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The comment style detection (i.e.
comment_style) checks the start of a line to determine the style, so it will misidentify lines starting with spaces, e.g.//# some contentwould be identified asCommentStyle::DoubleSlashand notCommentStyle::Custom("//# ")resulting in it determining there to be a comment of"", which it then indents and appends a\nbefore writing back the original comment.Fix this by trimming the line before trying to identify its style.
Fixes: #6612