Subject: 28.0.50; define hs-set-up-overlay with defcustom instead of defvar

From: Zhiwei Chen <[email-masked]>
Date: Wed, 19 May 2021 02:19:26 +0000

According to the docstring of hs-set-up-overlay, it can be customizable. So defcustom is more meaningful than defvar.

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Zhiwei Chen