[LyX/master] InsetMathSpace: use XML entities instead of HTML in MathML.

[Thibaut Cuvelier]

commit 9b80a5ba9e1d072daa9ec3fd3e6470e5460db1f4
Author: Thibaut Cuvelier <tcuvel...@lyx.org>
Date:   Mon Dec 26 20:35:26 2022 +0100

    InsetMathSpace: use XML entities instead of HTML in MathML.
    
    This part should have been committed with bc73a857 in the first place.
---
 src/mathed/InsetMathSpace.cpp |   17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/src/mathed/InsetMathSpace.cpp b/src/mathed/InsetMathSpace.cpp
index 874012d..f507592 100644
--- a/src/mathed/InsetMathSpace.cpp
+++ b/src/mathed/InsetMathSpace.cpp
@@ -203,11 +203,8 @@ void InsetMathSpace::mathmlize(MathMLStream & ms) const
        string l;
        if (si.custom)
                l = length_.asHTMLString();
-       else if (si.kind != InsetSpaceParams::MEDIUM) {
-               stringstream ss;
-               ss << si.width;
-               l = ss.str() + "px";
-       }
+       else if (si.kind != InsetSpaceParams::MEDIUM)
+               l = to_string(si.width) + "px";
 
        std::string attr;
        if (!l.empty())
@@ -222,23 +219,23 @@ void InsetMathSpace::htmlize(HtmlStream & ms) const
        SpaceInfo const & si = space_info[space_];
        switch (si.kind) {
        case InsetSpaceParams::THIN:
-               ms << from_ascii("&thinsp;");
+               ms << from_ascii("&#x2009;"); // HTML: &thinsp;
                break;
        case InsetSpaceParams::MEDIUM:
                ms << from_ascii("&#160;");
                break;
        case InsetSpaceParams::THICK:
-               ms << from_ascii("&emsp;");
+               ms << from_ascii("&#x2003;"); // HTML: &emsp;
                break;
        case InsetSpaceParams::ENSKIP:
        case InsetSpaceParams::ENSPACE:
-               ms << from_ascii("&ensp;");
+               ms << from_ascii("&#x2002;"); // HTML: &ensp;
                break;
        case InsetSpaceParams::QUAD:
-               ms << from_ascii("&emsp;");
+               ms << from_ascii("&#x2003;"); // HTML: &emsp;
                break;
        case InsetSpaceParams::QQUAD:
-               ms << from_ascii("&emsp;&emsp;");
+               ms << from_ascii("&#x2003;&#x2003;"); // HTML: &emsp;&emsp;
                break;
        case InsetSpaceParams::HFILL:
        case InsetSpaceParams::HFILL_PROTECTED:
-- 
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