9.53.3 Can you answer these questions?

9.53.3.1 Problem with prefix for selected citations and biblatex styles

https://tex.stackexchange.com/landing/r/digest?cta=question&id=692919

As described in the question Biblatex using prefix for selected keywords only, I need to highlight some references with a prefix, e.g., [A2]. Following the answer to the above question, I was able to ... 
[biblatex]
 

asked by christoph https://tex.stackexchange.com/landing/r/digest?cta=user&id=301032 Score of 1

answered by Alan Munn https://tex.stackexchange.com/landing/r/digest?cta=user&id=2693 Score of 0

9.53.3.2 QR code contains weird lines

https://tex.stackexchange.com/landing/r/digest?cta=question&id=692841

When using the qrcode package my QR codes have all of their pixels spread out causing lines to appear, see the image (hope it's visible). 
How do I get rid of this? More importantly, will it be visible ... 
[qrcode]
 

asked by Sorashi https://tex.stackexchange.com/landing/r/digest?cta=user&id=144491 Score of 1

9.53.3.3 Condition Based on Page Breaking

https://tex.stackexchange.com/landing/r/digest?cta=question&id=692946

I am working on some software to automatically format documents to comply with strict court rules. Under these rules, it sometimes matters whether a given piece of text appears on the front cover or ... 
[page-breaking] [conditionals]
 

asked by bbernicker https://tex.stackexchange.com/landing/r/digest?cta=user&id=250103 Score of 1