tdf#56467: improve export of formulas to SVG

tspan element only valid as child of text element
if exporting a selection use top left corner of bounding rect as top left corner of viewbox
export x coordinate of text position for text portions

Change-Id: I8b739085473aa4a48ff3bbbbe8c413c3cddbaebd
Reviewed-on: https://gerrit.libreoffice.org/14992Reviewed-by: Thorsten Behrens <thb@documentfoundation.org>
Tested-by: Thorsten Behrens <thb@documentfoundation.org>

filter/source/svg/svgexport.cxx

@@ -823,8 +823,8 @@ bool SVGFilter::implExportDocument()
             mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "clipPathUnits", "userSpaceOnUse" );
             SvXMLElementExport aClipPathElem( *mpSVGExport, XML_NAMESPACE_NONE, "clipPath", true, true );
             {
-                mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "x", OUString::number( 0 ) );
-                mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "y", OUString::number( 0 ) );
+                mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "x", OUString::number( nDocX ) );
+                mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "y", OUString::number( nDocY ) );
                 mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "width", OUString::number( nDocWidth ) );
                 mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "height", OUString::number( nDocHeight ) );
                 SvXMLElementExport aRectElem( *mpSVGExport, XML_NAMESPACE_NONE, "rect", true, true );

filter/source/svg/svgwriter.cxx

@@ -1541,7 +1541,7 @@ void SVGTextWriter::implWriteTextPortion( const Point& rPos,
     else
         aPos = rPos;
 
-    if( mbPositioningNeeded )
+    if( mbPositioningNeeded || bApplyMapping )
     {
         mbPositioningNeeded = false;
         maTextPos.setX( aPos.X() );
@@ -3510,7 +3510,9 @@ void SVGActionWriter::ImplWriteActions( const GDIMetaFile& rMtf,
                         }
                         else
                         {
+                            maTextWriter.startTextShape();
                             maTextWriter.writeTextPortion( pA->GetPoint(), aText );
+                            maTextWriter.endTextShape();
                         }
                     }
                 }