Reflowing Paragraphs in a Buffer

When editing text documents, paragraphs can often become split up into lines of varying lengths.

For example, starting from the following text:

One solution is to combine Vim's text formatting command gw with the paragraph text object selector ip:

gw{motion} tells Vim to format the lines that covered by {motion}, and the ip [[text object]] tells Vim to apply this formatting over the inner paragraph.

The lines of the paragraph are combined, then split at word boundaries to produce a sequence of lines with lengths that follow the width set by vim.opt.textwidth.