[LyX/master] Use proper minus sign character in MathML Core.

[Thibaut Cuvelier]

commit 790c15373782510d912ab3bd2c24393cda7fe85d
Author: Thibaut Cuvelier <tcuvel...@lyx.org>
Date:   Sat Sep 28 16:47:58 2024 +0200

    Use proper minus sign character in MathML Core.
    
    Fixes bug https://www.lyx.org/trac/ticket/13067.
    
    Based on the patch in the ticket above by Jean-Marc Lasgouttes.
---
 src/mathed/InsetMathChar.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/mathed/InsetMathChar.cpp b/src/mathed/InsetMathChar.cpp
index ebc1644af5..7e57bf28e5 100644
--- a/src/mathed/InsetMathChar.cpp
+++ b/src/mathed/InsetMathChar.cpp
@@ -239,6 +239,12 @@ void InsetMathChar::mathmlize(MathMLStream & ms) const
        case '<': entity = "&lt;"; break;
        case '>': entity = "&gt;"; break;
        case '&': entity = "&amp;"; break;
+       case '-':
+               if (ms.version() == MathMLStream::mathmlCore) {
+                       // − U+2212 MINUS SIGN
+                       entity = "&#x2212;";
+               }
+               break;
        case ' ': {
                ms << from_ascii("&#0160;");
                return;
-- 
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