[LyX/master] We really do not want id to change

[Richard Kimberly Heck]

commit 003a267764fb5ba36a6753f74c82c4f9bd2ab7ef
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Mon Sep 28 22:20:22 2020 -0400

    We really do not want id to change
---
 src/Layout.cpp |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Layout.cpp b/src/Layout.cpp
index 48328cc..f3dfa4a 100644
--- a/src/Layout.cpp
+++ b/src/Layout.cpp
@@ -1151,8 +1151,10 @@ void Layout::readSpacing(Lexer & lex)
 
 void Layout::readArgument(Lexer & lex, bool validating)
 {
-	string id;
-	lex >> id;
+	if (!lex.next())
+		return;
+	string const id = lex.getString();
+
 	bool const itemarg = prefixIs(id, "item:");
 	bool const postcmd = prefixIs(id, "post:");
 	bool const listpreamble = prefixIs(id, "listpreamble:");