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(emacs)Filling

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Filling Text
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   "Filling" text means breaking it up into lines that fit a specified
width.  Emacs does filling in two ways.  In Auto Fill mode, inserting
text with self-inserting characters also automatically fills it.  There
are also explicit fill commands that you can use when editing text
leaves it unfilled.  When you edit formatted text, you can specify a
style of filling for each portion of the text (Note: Formatted Text).

Auto Fill

Auto Fill mode breaks long lines automatically.

Refill

Keeping paragraphs filled.

Fill Commands

Commands to refill paragraphs and center lines.

Fill Prefix

Filling paragraphs that are indented

or in a comment, etc.

Adaptive Fill

How Emacs can determine the fill prefix automatically.