From 1d637b8af0f76d7c758db91ee3a196306f861a21 Mon Sep 17 00:00:00 2001
From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Sat, 18 Mar 2023 21:01:06 +0100
Subject: [PATCH] Spaces in typewriter font never expand in justified text

This fixes on-screen appearance of things like code with lines longer
than the window width.

The TeXbook makes it clear by indicating that \fontdimen3 == 0 for
these fonts.
---
 src/Row.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Row.cpp b/src/Row.cpp
index 8c86c7731c..7de4b61d9c 100644
--- a/src/Row.cpp
+++ b/src/Row.cpp
@@ -45,7 +45,7 @@ static double const MAX_SPACE_STRETCH = 1.5; //em
 
 int Row::Element::countExpanders() const
 {
-	if (type != STRING)
+	if (type != STRING || font.fontInfo().family() == TYPEWRITER_FAMILY)
 		return 0;
 	return support::countExpanders(str);
 }
@@ -53,7 +53,7 @@ int Row::Element::countExpanders() const
 
 int Row::Element::expansionAmount() const
 {
-	if (type != STRING)
+	if (type != STRING || font.fontInfo().family() == TYPEWRITER_FAMILY)
 		return 0;
 	return countExpanders() * theFontMetrics(font).em();
 }