4.7 Continuation Lines
If you add too many characters to one line without breaking it with
<RET>, the line will grow to occupy two (or more) lines on the screen,
with a curved arrow at the extreme right margin of all but the last of
them. The curved arrow says that the following screen line is not
really a distinct line in the text, but just the "continuation" of a
line too long to fit the screen. Continuation is also called "line
Sometimes it is nice to have Emacs insert newlines automatically when
a line gets too long. Continuation on the screen does not do that. Use
Auto Fill mode (Note: Filling) if that's what you want.
Instead of continuation, long lines can be displayed by "truncation".
This means that all the characters that do not fit in the width of the
frame or window do not appear at all. They remain in the buffer,
temporarily invisible. Right arrow in the last column (instead of the
curved arrow) inform you that truncation is in effect.
Truncation instead of continuation happens whenever horizontal
scrolling is in use, and optionally in all side-by-side windows (Note:
Windows). You can enable truncation for a particular buffer by
setting the variable `truncate-lines' to non-`nil' in that buffer.
(Note: Variables.) Altering the value of `truncate-lines' makes it
local to the current buffer; until that time, the default value is in
effect. The default is initially `nil'. Note: Locals.
Note: Display Vars, for additional variables that affect how text
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