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If you add too many characters to one line without breaking with a
RET, the line grows to occupy two (or more) screen lines, with a curved
arrow at the extreme right margin of all but the last line. The curved
arrow indicates 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. You can use Auto Fill mode (Note: Filling.) to have
Emacs insert newlines automatically when a line gets too long.
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
screen or window do not appear at all. They remain in the buffer,
temporarily invisible. Three diagonal dots in the last column (instead
of the curved arrow inform you that truncation is in effect.
To turn off continuation for a particular buffer, set the variable
`truncate-lines' to non-`nil' in that buffer. Truncation instead of
continuation also happens whenever horizontal scrolling is in use, and
optionally whenever side-by-side windows are in use (Note: Windows.).
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.
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