10.4.1 Top new questions this week

10.4.1.1 Upright letters in enumeration are not set justified

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706833

I use several enumerations in theorem-environments. The font is italic, but I wanted to set the labels (for which I use letters) upright. I read that I do this via \normalfontand it works. But I saw ... 
[enumerate] [enumitem]
 

asked by Lereu https://tex.stackexchange.com/landing/r/digest?cta=user&id=306095 Score of 8

answered by Sebastiano https://tex.stackexchange.com/landing/r/digest?cta=user&id=117876 Score of 8

10.4.1.2 Weird error in custom package instead of the error I tried to throw?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706486

I am making a custom package for all my personal commands, and I am trying to pass some keyword arguments to the package as described in section 4.4 of clsguide. My use case is that I take math and ... 
[package-writing] [key-value]
 

asked by Shai Avr https://tex.stackexchange.com/landing/r/digest?cta=user&id=274542 Score of 8

answered by Udi Fogiel https://tex.stackexchange.com/landing/r/digest?cta=user&id=264024 Score of 8

10.4.1.3 What algorithm does LuaLaTeX use for fallback fonts?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706656

Background 
I have been busy with a book about the worlds scripts and languages on and off for a couple of years. It covers all the listed scripts in unicode, as well as a dozen or so, where there is ... 
[luatex] [luaotfload]
 

asked by yannisl https://tex.stackexchange.com/landing/r/digest?cta=user&id=963 Score of 7

10.4.1.4 How to make branches in a game tree parallel?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706776

I created the following game tree: 
Here is my code: 
\documentclass[leqno, oneside, 12pt]{book} 
\usepackage{amsmath} 
\usepackage{istgame} 
\usepackage{caption} 
\usepackage{makecell} 
\begin{document} 
\... 
[tikz-pgf] [tikz-styles] [tikz-trees] [game-tree] [istgame]
 

asked by Beerus https://tex.stackexchange.com/landing/r/digest?cta=user&id=312186 Score of 7

answered by Altissimo https://tex.stackexchange.com/landing/r/digest?cta=user&id=312166 Score of 6

10.4.1.5 Draw a shape "inside" another one

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706667

I'd like to draw a shape (with right only angles) inside another (with only right angles). The edges should be as close as possible without overlapping. 
I can do something by hand, as follows: 
\... 
[tikz-pgf] [diagrams]
 

asked by ClA~(c)ment https://tex.stackexchange.com/landing/r/digest?cta=user&id=34551 Score of 7

answered by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 Score of 10

10.4.1.6 How to change font inside \DeclareMathOperator?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706437

LaTeX friends. I need to change the font inside \DeclareMathOperator, but my initial attempt failed, as the example below shows. How can I achieve the desired result? 
\documentclass{article} 
\... 
[fonts] [amsmath] [math-operators]
 

asked by Gonzalo Medina https://tex.stackexchange.com/landing/r/digest?cta=user&id=3954 Score of 7

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 7

10.4.1.7 expl3's regex_replace_all has a problem with German A~\237, why?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=706404

EDIT: Solution for this problem below. 
I'm trying to have an in-text direct replacement of entire words, but it seems using regex_replace_all does not work properly as it does not find a word ending ... 
[expl3] [german] [l3regex]
 

asked by learex https://tex.stackexchange.com/landing/r/digest?cta=user&id=218587 Score of 7

answered by Ulrike Fischer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2388 Score of 7