Docs of template_preprocess_html() refer to wrong hook

could you elaborate the issue here? on what specific files it is located?so anyone can make a patch on it

#2: system_element_info_reference-1671498-2.patch queued for re-testing.

This is still relevant but needs a reroll, just search core for system_elements() and replace with system_element_info().

Ok I'll work on a re-roll for this one

Well I've searched core for system_elements() and the only place where that exists, is in core/includes/theme.inc, which has already been changed in patch #2, I believe this is ready to be marked as needs review. (marking it now)

@g3r4 - the patch from #2 no longer applies to 8.x HEAD because it was created ~2 years ago, we need a new patch please :)

Ok great, will work on that !

Thanks for the heads up @Cottser

Ok, I think this is it

Looks good, thanks!

Committed/pushed to 8.x, thanks!