Re: LyX2.4.4 Problem with textquoteright when used as an apostrophe in a box containing a Listing

> Am 12.12.2025 um 20:06 schrieb Gerhard Gsänger via lyx-users <[email protected]>:
> 
> Hi
> I’m using LyX2.4.4 on my Macbook M2 with Tahoe 26.1.
> 
> Attached is a small LyX example, demonstration the issue.
> 
> When I copy the following sentence from a website and paste it into a LyX documents the apostrophe (textquoteright) used in „doesn’t“ is causing an error when viewing the doc as PDF (LuaTex):
> 
> CTAD doesn’t (currently) work with function parameters.
> 
> The details are explained in the attached LyX file. The error happens only when this textquoteright is used inside a box containing the text plus a Listing box.
> What can I improve?
> 
> 
> Gerd
> 
> 
> 
> <textquoteright.lyx>-- 
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Update: I would like to add a better description, some assumptions regarding cause und a proposed workaround.


Subject: LuaLaTeX crashes on typographic quotes inside boxes containing listings

Description:

In LyX 2.4.4, when a document contains boxes (e.g., Simple Frame) that include both ordinary text with typographic quotation marks (‘ U+2018, ’ U+2019, “ U+201C, ” U+201D) and a listings environment, compiling with LuaLaTeX produces errors such as:

Undefined control sequence.
doesn\T
1\textquoteright t ...

	•	The error does not occur in boxes that contain only text, nor in normal paragraphs.
	•	LyX editor displays the typographic quotes correctly.
	•	PDF output may appear correct depending on font ligatures, but LuaLaTeX fails during compilation when the listing is present in the same box as typographic quotes.

Not a LyX-specific issue:
	•	A plain LaTeX file containing the same box + listing + typographic quotes exhibits the exact same LuaLaTeX error.
	•	Compiling the same file with standard pdfLaTeX produces no error.
	•	This confirms that the issue is due to LuaLaTeX’s handling of Unicode typographic quotes in fragile environments, not LyX itself.

Cause:
	•	LuaLaTeX attempts to expand Unicode typographic quotes to LaTeX commands (e.g., \textquoteright) inside fragile box/listing combinations, which is not allowed, causing compilation errors.

Workarounds:
	1.	Replace typographic quotes with ASCII ' or " before pasting into boxes.
	2.	Or, add the following macro to the LaTeX preamble to convert all typographic quotes to ASCII at compile time:

\AtBeginDocument{%
  \catcode`’=\active \protected\def’{'}%
  \catcode`‘=\active \protected\def‘{'}%
  \catcode`“=\active \protected\def“{"}%
  \catcode`”=\active \protected\def”{"}%
}

	•	Ensures LuaLaTeX compiles successfully while retaining typographic appearance in the PDF.

Steps to reproduce:
	1.	Create a LyX 2.4.4 document (or plain LaTeX file).
	2.	Insert a Simple Frame box (or minipage/tcolorbox).
	3.	Inside the box, add:
	•	A text string containing typographic quotes.
	•	A listings environment with code.
	4.	Compile using LuaLaTeX.
	5.	Observe the “Undefined control sequence” error related to \textquoteright.
	6.	Compile with standard pdfLaTeX: no error occurs.

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