All downstream changes from the theme (i.e. here) will be denoted with:
/* hacks-guide change start */
and
/* hacks-guide change end */
One-line changes are marked with
/* hacks-guide change */
next to it.
Since our theme does not have linear history with upstream, this allows
quicker identification of what exactly has differentiated downstream,
as we do have a few out-of-tree patches for extra functionality.
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