[LyX/master] Set Buffer for MathData when creating macro view

[Richard Kimberly Heck]

commit c395eda34741fb3c724f0b374f6657f881fef6e0
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Thu Apr 18 18:22:52 2024 -0400

    Set Buffer for MathData when creating macro view
---
 src/mathed/InsetMathMacroTemplate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mathed/InsetMathMacroTemplate.cpp b/src/mathed/InsetMathMacroTemplate.cpp
index 2a721833b0..9fe10491e2 100644
--- a/src/mathed/InsetMathMacroTemplate.cpp
+++ b/src/mathed/InsetMathMacroTemplate.cpp
@@ -506,7 +506,7 @@ void InsetMathMacroTemplate::createLook(int args) const
 
 	// {#3}{#4}
 	for (; i < numargs_; ++i) {
-		MathData arg;
+		MathData arg(buffer_);
 		arg.push_back(MathAtom(new InsetMathMacroArgument(i + 1)));
 		if (i >= argsInLook_) {
 			look_.push_back(MathAtom(new InsetColoredCell(buffer_,