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From: Van L <van@scratch.space>
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Subject: Re: DocView resolution for PDF on WQHD
Date: Sat, 23 Jun 2018 02:14:10 +1000
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> Setting 'Doc View Resolution' to 192
> and reloading the PDF doesn=E2=80=99t improve
> the font rendering.

The clue from lisp/doc-view.el=20
is to call `doc-view-clear-cache`
and the 192 resolution takes effect.