12.15.3 Can you answer these questions?

12.15.3.1 A revisitation of 3D surface outlines, using more specific language

https://tex.stackexchange.com/landing/r/digest?cta=question&id=760422

This question has technically been asked before: Creating outlines of 3D surfaces in Tikz. Frankly, here too: Surface outline a^\200\223 pgfplots 3D. 
I have thought about the problem in some detail, and ... 
[diagrams] [3d] [lua]
 

asked by Jasper https://tex.stackexchange.com/landing/r/digest?cta=user&id=319072 Score of 1

12.15.3.2 An error with `tlmgr update --all` with TL2026?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=760437

I was not sure whether the case related to this post (fixed seemly in the comment) and the discussion. 
I run the tlmgr update --self and tlmgr update --all, here below is the terminal output (full ... 
[texlive] [tlmgr]
 

asked by Explorer https://tex.stackexchange.com/landing/r/digest?cta=user&id=322482 Score of 1

12.15.3.3 longtable: gap below first subtable

https://tex.stackexchange.com/landing/r/digest?cta=question&id=760279

The following longtable always starts at the top of the text-body. 
I've noticed that the very first subtable in the following longtable has one less row than the other (page-height) subtables - even ... 
[tables] [longtable]
 

asked by cis https://tex.stackexchange.com/landing/r/digest?cta=user&id=46023 Score of 4