watch: Add no linewrap option

For long lines from a process, watch would wrap them around to the
next. While this default option has it uses, sometimes you want to
just cut those long lines down.

watch has a -w flag which will truncate the lines to the number
of columns. A few simple lines to do this new trick.

I think I caught all the ANSI state correctly but there might be
a chance it bleeds to the next row.

References:
 procps-ng/procps#182

watch.1

@@ -1,4 +1,4 @@
-.TH WATCH 1 "2020-06-04" "procps-ng" "User Commands"
+.TH WATCH 1 "2020-10-19" "procps-ng" "User Commands"
 .SH NAME
 watch \- execute a program periodically, showing output fullscreen
 .SH SYNOPSIS
@@ -64,6 +64,9 @@ instead of
 .B sh \-c
 which reduces the need to use extra quoting to get the desired effect.
 .TP
+\fB\-w\fR, \fB\-\-no\-linewrap\fR
+Turn off line wrapping. Long lines will be truncated instead of wrapped to the next line.
+.TP
 \fB\-h\fR, \fB\-\-help\fR
 Display help text and exit.
 .TP