fdo#66024 - Formula Editor: make wide accents stretchy when exported to MathML

Change-Id: Ifd0adc51d79e0673661b5646d27f657768ea5b20
Reviewed-on: https://gerrit.libreoffice.org/4450Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

starmath/inc/types.hxx

@@ -139,8 +139,10 @@ enum MathSymbol
 
     MS_GRAVE        = (sal_Unicode) 0x0300,
     MS_ACUTE        = (sal_Unicode) 0x0301,
-    MS_HAT          = (sal_Unicode) 0x0302,
-    MS_TILDE        = (sal_Unicode) 0x0303,
+    MS_HAT          = (sal_Unicode) 0x005E,
+    MS_COMBHAT      = (sal_Unicode) 0x0302,
+    MS_TILDE        = (sal_Unicode) 0x007E,
+    MS_COMBTILDE    = (sal_Unicode) 0x0303,
     MS_BAR          = (sal_Unicode) 0x0304,
     MS_BREVE        = (sal_Unicode) 0x0306,
     MS_CIRCLE       = (sal_Unicode) 0x030A,

starmath/source/mathmlexport.cxx

@@ -1121,6 +1121,15 @@ void SmXMLExport::ExportAttributes(const SmNode *pNode, int nLevel)
             break;
         case TOVERSTRIKE:
             break;
+        case TWIDETILDE:
+        case TWIDEHAT:
+        case TWIDEVEC:
+            {
+            // make these wide accents stretchy
+            AddAttribute(XML_NAMESPACE_MATH, XML_STRETCHY, XML_TRUE);
+            ExportNodes(pNode->GetSubNode(0), nLevel+1);
+            }
+            break;
         default:
             ExportNodes(pNode->GetSubNode(0), nLevel+1);
             break;

starmath/source/node.cxx

@@ -2820,10 +2820,12 @@ void SmAttributNode::CreateTextFromNode(String &rText)
             case MS_VEC: // COMBINING RIGHT ARROW ABOVE
                 rText += "vec ";
                 break;
-            case MS_TILDE: // COMBINING TILDE
+            case MS_TILDE: // TILDE
+            case MS_COMBTILDE: // COMBINING TILDE
                 rText += "tilde ";
                 break;
-            case MS_HAT: // COMBINING CIRCUMFLEX ACCENT
+            case MS_HAT: // CIRCUMFLEX ACCENT
+            case MS_COMBHAT: // COMBINING CIRCUMFLEX ACCENT
                 rText += "hat ";
                 break;
             case MS_BAR: // COMBINING MACRON

starmath/source/ooxmlimport.cxx

@@ -192,9 +192,11 @@ OUString SmOoxmlImport::handleAcc()
             acc = "widevec";
             break;
         case MS_TILDE:
+        case MS_COMBTILDE:
             acc = "widetilde";
             break;
         case MS_HAT:
+        case MS_COMBHAT:
             acc = "widehat";
             break;
         case MS_DOT: