I guess the same happens, when using the include graphics function from the LaTeX menu. If the file to be inserted has a long filename, the automatically inserted comment line will be wrapped in this way:
\includegraphics{directory/quite_long_filename_quite_long_filename.pdf} % quite_long_filename_quite_long_filename.pdf: 595x842 pixel, 72dpi, 20.99x29.70 cm, bb=0 0 595 842
I guess the same happens, when using the include graphics function from the LaTeX menu. If the file to be inserted has a long filename, the automatically inserted comment line will be wrapped in this way:
\includegraph ics{directory/ quite_long_ filename_ quite_long_ filename. pdf} filename_ quite_long_ filename. pdf: 595x842 pixel, 72dpi, 20.99x29.70 cm,
% quite_long_
bb=0 0 595 842