prefix-fill-paragraph

Fill a paragraph preserving indentation and similar.

Alt-Shift-Q

This command examines the current line to determine its "prefix", a run of non-alphanumeric characters at the start of the line. Then it determines the boundaries of the current paragraph among those adjacent lines that share this prefix. Then it fills that paragraph, ensuring the prefix remains at the start of each line. With a region highlighted, it fills all paragraphs within the region in the same manner.

With a numeric argument, it fills paragraphs using the current column as the right margin, instead of the margin-right variable.

The mail-fill-paragraph command is similar, but specialized for email quoting rules.

More info:

Formatting Text

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