tdf#73691 - add alt-x support to math

At the request of bug tdf#94957, adding unicode conversion
shortcut (alt+x) to Math also.

Change-Id: I5b4d17543a819f035ade0d9a516eeef8542a286e
Reviewed-on: https://gerrit.libreoffice.org/19323Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

starmath/sdi/smath.sdi

@@ -800,6 +800,31 @@ SfxStringItem TextStatus SID_TEXTSTATUS
 ]
 
 
+SfxVoidItem UnicodeNotationToggle SID_UNICODE_NOTATION_TOGGLE
+()
+[
+    /* flags: */
+    AutoUpdate = FALSE,
+    Cachable = Cachable,
+    FastCall = FALSE,
+    HasCoreId = FALSE,
+    HasDialog = FALSE,
+    ReadOnlyDoc = FALSE,
+    Toggle = FALSE,
+    Container = FALSE,
+    RecordAbsolute = FALSE,
+    RecordPerSet;
+    Synchron;
+
+    /* config: */
+    AccelConfig = TRUE,
+    MenuConfig = FALSE,
+    StatusBarConfig = FALSE,
+    ToolBoxConfig = FALSE,
+    GroupId = GID_OPTIONS;
+]
+
+
 SfxVoidItem ToolBoxWindow SID_TOOLBOXWINDOW
 ()
 [

starmath/sdi/smslots.sdi

@@ -291,6 +291,10 @@ interface FormulaView
         ExecMethod = Execute ;
         StateMethod = GetState ;
     ]
+    SID_UNICODE_NOTATION_TOGGLE
+    [
+        ExecMethod = Execute;
+    ]
     //idlpp kein Menueeintrag , also keine Texte
     SID_TOOLBOXWINDOW //idlpp ole : no , status : no
     [

starmath/source/view.cxx

@@ -29,6 +29,7 @@
 #include <comphelper/processfactory.hxx>
 #include <comphelper/storagehelper.hxx>
 #include <comphelper/string.hxx>
+#include <i18nutil/unicode.hxx>
 #include <sfx2/app.hxx>
 #include <sfx2/dispatch.hxx>
 #include <sfx2/docfile.hxx>
@@ -52,6 +53,7 @@
 #include <svx/dialogs.hrc>
 #include <svx/zoomslideritem.hxx>
 #include <editeng/editeng.hxx>
+#include <editeng/editview.hxx>
 #include <svx/svxdlg.hxx>
 #include <sfx2/zoomitem.hxx>
 #include <vcl/decoview.hxx>
@@ -1844,6 +1846,51 @@ void SmViewShell::Execute(SfxRequest& rReq)
         }
         break;
 
+        case SID_UNICODE_NOTATION_TOGGLE:
+        {
+            EditEngine* pEditEngine = 0;
+            if( pWin )
+                pEditEngine = pWin->GetEditEngine();
+
+            EditView* pEditView = 0;
+            if( pEditEngine )
+                pEditView = pEditEngine->GetView();
+
+            if( pEditView )
+            {
+                const OUString sInput = pEditView->GetSurroundingText();
+                ESelection aSel(  pWin->GetSelection() );
+
+                if ( aSel.nStartPos > aSel.nEndPos )
+                    aSel.nEndPos = aSel.nStartPos;
+
+                //calculate a valid end-position by reading logical characters
+                sal_Int32 nUtf16Pos=0;
+                while( (nUtf16Pos < sInput.getLength()) && (nUtf16Pos < aSel.nEndPos) )
+                {
+                    sInput.iterateCodePoints(&nUtf16Pos);
+                    if( nUtf16Pos > aSel.nEndPos )
+                        aSel.nEndPos = nUtf16Pos;
+                }
+
+                ToggleUnicodeCodepoint aToggle;
+                while( nUtf16Pos && aToggle.AllowMoreInput( sInput[nUtf16Pos-1]) )
+                    --nUtf16Pos;
+                const OUString sReplacement = aToggle.ReplacementString();
+                if( !sReplacement.isEmpty() )
+                {
+                    pEditView->SetSelection( aSel );
+                    pEditEngine->UndoActionStart(EDITUNDO_REPLACEALL);
+                    aSel.nStartPos = aSel.nEndPos - aToggle.StringToReplace().getLength();
+                    pWin->SetSelection( aSel );
+                    pEditView->InsertText( sReplacement, true );
+                    pEditEngine->UndoActionEnd(EDITUNDO_REPLACEALL);
+                    pWin->Flush();
+                }
+            }
+        }
+        break;
+
         case SID_SYMBOLS_CATALOGUE:
         {