bug#70295: [PATCH] Allow preprocessing of previews

[Paul Nelson]

Hello,

The attached patch introduces an optional preprocessing step to preview-region.

As motivation, I've been using such functionality (implemented via
advice) in https://github.com/ultronozm/czm-preview.el to give correct
equation numbers in previews.  This patch would allow me to excise the
advice.

Thanks, best,

Paul

0001-Allow-programmatic-preprocessing-of-previews.patch
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