Set prose-wrap to preserve by default

[ryuapp]

This cons may not exist in anglosphere, but a popular Japanese technology blog site (Zenn) recognizes new lines in markdown as new lines, so when markdown is formatted using deno fmt, it will break. Also, the commonly used Prettier's defaults to prose-wrap: preserve. Therefore, it is better to set prose-wrap to preserve by default.

I understand that it can be changed in the options, but I don't know the pros of setting it to always by default.

Related: #9191 prettier/prettier#6516

[dsherret]

I personally prefer preserve (it's the default in dprint-plugin-markdown)

[lucacasonato]

I don't have very strong opinions, but the pro of setting it to always is that you always linebreak at 80 columns - you don't get very long lines.

[ryuapp]

I don't have very strong opinions, but the pro of setting it to always is that you always linebreak at 80 columns - you don't get very long lines.

After seeing this, I realized that the problem is that deno fmt does not support natural language formats such as Japanese and Chinese in the first place. I stated the problem there(dprint/dprint-plugin-markdown#120).

Natural languages ​​like Japanese and Chinese do not use spaces to separate text. However, English words often appear in sentences, so they are separated unnaturally.
Ref: https://en.wikipedia.org/wiki/Word_divider#Types

I don't know if deno fmt will support them in the future, but basically it is difficult to properly separate those languages text. That's why I think preserve being the default is very valuable.

[tats-u]

Ideal implementation of always for Japanese/Chinese is complex.

文文文
文文文

The above is rendered as 文文文文文文 by Firefox, and 文文文 文文文 by Chrome and Safari. (The latter is treated as a bug today but has too low priority to be fixed soon)

Moreover, there are some Markdown extension incompatible with always, for example:

:::warning
These 3 lines can be mistakenly merged into single line.
:::

The above admonition is not compatible with Prettier's always, either.
I strongly claims that preserve is the safest for Markdown. We should have changed it as of Deno v2.

[tats-u]

Prettier's default is preserve.

https://prettier.io/docs/en/options.html#prose-wrap