[LyX features/biginset] MathML: don't output delimiters in InsetMathBinom and InsetMathDelim if the delimiter is a space.

[Thibaut Cuvelier]

commit be03d699463fba896f90e3046b0814d527368771
Author: Thibaut Cuvelier <tcuvel...@lyx.org>
Date:   Mon Mar 11 01:30:48 2024 +0100

    MathML: don't output delimiters in InsetMathBinom and
     InsetMathDelim if the delimiter is a space.
---
 src/mathed/InsetMathDelim.cpp | 23 ++++++++++++++---------
 src/mathed/InsetMathFrac.cpp  | 21 +++++++++++++--------
 2 files changed, 27 insertions(+), 17 deletions(-)

diff --git a/src/mathed/InsetMathDelim.cpp b/src/mathed/InsetMathDelim.cpp
index 78d26fceea..d32029b818 100644
--- a/src/mathed/InsetMathDelim.cpp
+++ b/src/mathed/InsetMathDelim.cpp
@@ -189,15 +189,20 @@ void InsetMathDelim::mathematica(MathematicaStream & os) 
const
 
 void InsetMathDelim::mathmlize(MathMLStream & ms) const
 {
-       ms << MTag("mrow")
-          << MTagInline("mo", "form='prefix' fence='true' stretchy='true' 
symmetric='true'")
-          << convertDelimToXMLEscape(left_)
-          << ETagInline("mo")
-          << cell(0)
-          << MTagInline("mo", "form='postfix' fence='true' stretchy='true' 
symmetric='true'")
-          << convertDelimToXMLEscape(right_)
-          << ETagInline("mo")
-          << ETag("mrow");
+       // Ignore the delimiter if: it is empty or only a space (one character).
+       if (!left_.empty() && ((left_.size() == 1 && left_[0] != ' ') || 
left_.size() > 1)) {
+           ms << MTag("mrow")
+              << MTagInline("mo", "form='prefix' fence='true' stretchy='true' 
symmetric='true'")
+              << convertDelimToXMLEscape(left_)
+              << ETagInline("mo");
+       }
+       ms << cell(0);
+       if (!right_.empty() && ((right_.size() == 1 && right_[0] != ' ') || 
right_.size() > 1)) {
+           ms << MTagInline("mo", "form='postfix' fence='true' stretchy='true' 
symmetric='true'")
+              << convertDelimToXMLEscape(right_)
+              << ETagInline("mo")
+              << ETag("mrow");
+       }
 }
 
 
diff --git a/src/mathed/InsetMathFrac.cpp b/src/mathed/InsetMathFrac.cpp
index f6f2f95b0a..b0ff55bc4d 100644
--- a/src/mathed/InsetMathFrac.cpp
+++ b/src/mathed/InsetMathFrac.cpp
@@ -768,15 +768,20 @@ void InsetMathBinom::mathmlize(MathMLStream & ms) const
                rdelim = ']';
                break;
        }
-       ms << MTagInline("mo", "fence='true' stretchy='true' form='prefix'")
-          << ldelim
-          << ETagInline("mo")
-          << MTagInline("mfrac", "linethickness='0'")
+
+       if (ldelim != ' ') {
+           ms << MTagInline("mo", "fence='true' stretchy='true' form='prefix'")
+              << ldelim
+              << ETagInline("mo");
+       }
+       ms << MTagInline("mfrac", "linethickness='0'")
           << cell(0) << cell(1)
-       << ETagInline("mfrac")
-          << MTagInline("mo", "fence='true' stretchy='true' form='postfix'")
-          << rdelim
-          << ETagInline("mo");
+          << ETagInline("mfrac");
+       if (rdelim != ' ') {
+           ms << MTagInline("mo", "fence='true' stretchy='true' 
form='postfix'")
+              << rdelim
+              << ETagInline("mo");
+       }
 }
 
 
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