Returns the textual representation (not including color or other attributes) of the physical lines of text in the viewport as a string.
A physical line is a possibly-wrapped line that composes a row in the terminal display matrix. If you'd rather operate on logical lines, see pane:get_logical_lines_as_text.
If the optional
nlines argument is specified then it is used to determine how
many lines of text should be retrieved. The default (if
nlines is not specified)
is to retrieve the number of lines in the viewport (the height of the pane).
The lines have trailing space removed from each line. The lines will be
joined together in the returned string separated by a
Trailing blank lines are stripped, which may result in fewer lines being
returned than you might expect if the pane only had a couple of lines