bug#70307: [PATCH] Allow preview to work in non-file buffers

[Ikumi Keita]

Hi Arash,

>>>>> Arash Esbati <arash@gnu.org> writes:
> @David and Keita: WDYT, any comments?

This makes difference only when the file name is "<none>", so it
wouldn't affect almost all regular usage. Thus I'm fine with applying
this change.

Regards,
Ikumi Keita
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