X/Open Curses says nothing about this case and SVr4 curses doesn't explicitly handle it, instead preforming a lot of arithmetic, the consequences of which are not obvious to me.
https://github.com/ryanwoodsmall/oldsysv/blob/e68293af91e2dc39f5f29c20d7e429f9e0cabc75/sysvr4/svr4/lib/xlibcurses/screen/winsdelln.c#L76 --- man/curs_deleteln.3x | 2 ++ 1 file changed, 2 insertions(+) diff --git a/man/curs_deleteln.3x b/man/curs_deleteln.3x index 46f183c39..c9c8503ca 100644 --- a/man/curs_deleteln.3x +++ b/man/curs_deleteln.3x @@ -96,6 +96,8 @@ .SH DESCRIPTION .B \%winsertln or .BR \%wdeleteln "." +.BR \%winsdelln( ".\|.\|." ", 0)" +performs no operation. .SH RETURN VALUE These functions return .B OK -- 2.30.2
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