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### 5.22 How can I make Emacs automatically scroll horizontally?

In Emacs 21 and later, this is on by default: if the variable `truncate-lines` is non-`nil` in the current buffer, Emacs automatically scrolls the display horizontally when point moves off the left or right edge of the window.

Note that this is overridden by the variable `truncate-partial-width-windows` if that variable is non-`nil` and the current buffer is not full-frame width.

In Emacs 20, use `hscroll-mode`.