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softwrap: move the updating of a softwrapped line to a new function
David Lawrence Ramsey authored
The new function, update_softwrapped_line(), is called from inside
update_line() when softwrap mode is on, so that existing calls remain
unchanged.  It takes no index, instead displaying edittop from column
firstcolumn, and all other lines from column zero.

If current is on edittop, it's displayed using the edittop rules, but
this is not a problem: if current[current_x] is above edittop at column
firstcolumn, it's offscreen, and that should be handled before calling
update_line() anyway.

Together with the preceding bunch of changes,
this fixes https://savannah.gnu.org/bugs/?47667.
2f6c8987
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