From: Juergen Spitzmueller <spitz@lyx.org>
Date: Sun, 21 Jan 2018 11:24:02 +0000 (+0100)
Subject: Fix output of quote ligatures with TeX font LuaTeX
X-Git-Tag: lyx-2.4.0dev-acb2ca7b~3989
X-Git-Url: https://git.lyx.org/gitweb/?a=commitdiff_plain;h=5fce313ffccea424487c83037b16f72f4f48eeb9;p=features.git

Fix output of quote ligatures with TeX font LuaTeX

Fixes: #10988
---

diff --git a/src/insets/InsetQuotes.cpp b/src/insets/InsetQuotes.cpp
index 7ae2d0ff9b..1613eb3d26 100644
--- a/src/insets/InsetQuotes.cpp
+++ b/src/insets/InsetQuotes.cpp
@@ -898,15 +898,21 @@ void InsetQuotes::latex(otexstream & os, OutputParams const & runparams) const
 	if (!runparams.pass_thru) {
 		// Guard against unwanted ligatures with preceding text
 		char_type const lastchar = os.lastChar();
+		// LuaTeX does not respect {} as ligature breaker by design,
+		// see https://tex.stackexchange.com/q/349725/19291
+		docstring const nolig =
+				(runparams.flavor == OutputParams::LUATEX
+				 || runparams.flavor == OutputParams::DVILUATEX) ?
+					from_ascii("\\/") : from_ascii("{}");
 		// !` ?` => !{}` ?{}`
 		if (prefixIs(qstr, from_ascii("`"))
 		    && (lastchar == '!' || lastchar == '?'))
-			os << "{}";
+			os << nolig;
 		// ``` ''' ,,, <<< >>>
 		// => `{}`` '{}'' ,{},, <{}<< >{}>>
 		if (contains(from_ascii(",'`<>"), lastchar)
 		    && prefixIs(qstr, lastchar))
-			os << "{}";
+			os << nolig;
 	}
 
 	os << qstr;