[LyX/master] Use background to make math comments more visible

[Jean-Marc Lasgouttes]

commit 3040eb0fa2930ae117b9166217ddb8089997c5aa
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Wed Jun 5 10:41:47 2024 +0200

    Use background to make math comments more visible
---
 src/mathed/InsetMathComment.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/mathed/InsetMathComment.cpp b/src/mathed/InsetMathComment.cpp
index 273253ec0e..2fdcde369e 100644
--- a/src/mathed/InsetMathComment.cpp
+++ b/src/mathed/InsetMathComment.cpp
@@ -16,6 +16,10 @@
 #include "MathStream.h"
 #include "MathSupport.h"
 
+#include "frontends/Painter.h"
+
+#include "MetricsInfo.h"
+
 #include <ostream>
 
 
@@ -55,6 +59,8 @@ void InsetMathComment::metrics(MetricsInfo & mi, Dimension & dim) const
 
 void InsetMathComment::draw(PainterInfo & pi, int x, int y) const
 {
+	Dimension const & dim = dimension(*pi.base.bv);
+	pi.pain.fillRectangle(x, y - dim.asc, dim.wid, dim.height(), Color_notebg);
 	cell(0).draw(pi, x, y);
 }