8.5.3 Can you answer these questions?

8.5.3.1 Add kern-font-feature so that it applies to a combination of italic and regular letter-combination

https://tex.stackexchange.com/landing/r/digest?cta=question&id=630896

I would like to add the kern-font-feature to two fonts so that it covers certain italic and regular glyphe-combinations between the two of them. 
I have succeeded in adding them to the regular and ... 
[kerning] [font-features]
 

asked by Kubo https://tex.stackexchange.com/landing/r/digest?cta=user&id=134455 1 vote

8.5.3.2 How to insert a space inside NiceArray while maintain alignment of \Block with \SubMatrix

https://tex.stackexchange.com/landing/r/digest?cta=question&id=630788

I am trying to align multiple math equations with braces using nicematrix 
The result above is as desired but I would like to 
Add small space after the third row. However, this causes the contents of ... 
[math-mode] [nicematrix] [submatrix]
 

asked by Al-Motasem Aldaoudeyeh https://tex.stackexchange.com/landing/r/digest?cta=user&id=136098 1 vote

8.5.3.3 Shorter beamer navigation bar with lots of sections

https://tex.stackexchange.com/landing/r/digest?cta=question&id=630814

I'm trying to create a latex beamer with 8 or 9 sections, but with this much sections the navigation bar on the top of each slides looks big and occupies quite some space. Can I shorten the navigation ... 
[beamer] [sectioning] [navigation]
 

asked by XiaoPan https://tex.stackexchange.com/landing/r/digest?cta=user&id=214787 1 vote