OMML reader: handle w:ins elements in math.

Previously we skipped these, which meant that content
would disappear.  Closes #278.

Author: jgm

flake.lock

@@ -95,6 +95,7 @@ hasElemName prefix name qn =
 data OMathRunElem = TextRun T.Text
                   | LnBrk
                   | Tab
+                  | Inserted [OMathRunElem]
                     deriving Show
 
 data OMathRunTextStyle = NoStyle
@@ -165,6 +166,7 @@ elemToOMathRunElem element
   | isElem "w" "br" element = Just LnBrk
   | isElem "w" "tab" element = Just Tab
   | isElem "w" "sym" element = Just $ TextRun $ getSymChar element
+  | isElem "w" "ins" element = Just $ Inserted $ mapMaybe elemToOMathRunElem (elChildren element)
   | otherwise = Nothing
 
 elemToOMathRunElems :: Element -> Maybe [OMathRunElem]
@@ -180,6 +182,7 @@ oMathRunElemToText :: OMathRunElem -> T.Text
 oMathRunElemToText (TextRun s) = s
 oMathRunElemToText (LnBrk) = "\n"
 oMathRunElemToText (Tab) = "\t"
+oMathRunElemToText (Inserted es) = mconcat $ map oMathRunElemToText es
 
 oMathRunElemsToText :: [OMathRunElem] -> T.Text
 oMathRunElemsToText = T.concat . map oMathRunElemToText

src/Text/TeXMath/Readers/OMML.hs

@@ -0,0 +1,4 @@
+<<< omml
+<m:oMath><m:r><w:ins w:id="2" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><m:rPr><m:nor/></m:rPr><w:rPr><w:rFonts w:cs="Times New Roman"/><w:sz w:val="28"/></w:rPr><m:t>∆</m:t></w:ins></m:r><m:r><w:ins w:id="3" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr><m:t>F</m:t></w:ins></m:r><m:r><w:ins w:id="4" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><m:rPr><m:sty m:val="p"/></m:rPr><w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr><m:t>/</m:t></w:ins></m:r><m:sSub><m:sSubPr><m:ctrlPr><w:ins w:id="5" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr></w:ins></m:ctrlPr></m:sSubPr><m:e><m:r><w:ins w:id="6" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr><m:t>F</m:t></w:ins></m:r></m:e><m:sub><m:r><w:ins w:id="7" w:author="Tron Su" w:date="2025-12-16T22:06:00Z" w16du:dateUtc="2025-12-16T14:06:00Z"><w:rPr><w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/></w:rPr><m:t>0</m:t></w:ins></m:r></m:sub></m:sSub></m:oMath>
+>>> tex
+\mathrm{\Delta}F/F_{0}