Do not convert SVGs to JPEGs when editing with external tool

This patch adds support for opening SVGs in the user's default SVG
viewer/editor. If the image cannot be exported to SVG directly, it is
exported as PNG instead. In no case will an SVG or an unrecognized
format be lossy-converted to JPEG.

Change-Id: I46dc8548c3cfb4d24a4a0078d4e3d7eee8367b1c

svx/source/core/extedit.cxx

@@ -100,7 +100,7 @@ void ExternalToolEdit::Edit( GraphicObject* pGraphicObject )
 
     //Write Graphic to the Temp File
     GraphicFilter& rGraphicFilter = GraphicFilter::GetGraphicFilter();
-    sal_uInt16 nFilter(rGraphicFilter.GetExportFormatNumber(fExtension));
+    sal_uInt16 nFilter(rGraphicFilter.GetExportFormatNumberForShortName(fExtension));
 
     OUString aFilter(rGraphicFilter.GetExportFormatShortName(nFilter));
 

svx/source/core/graphichelper.cxx

@@ -84,6 +84,9 @@ void GraphicHelper::GetPreferredExtension( OUString& rExtension, const Graphic&
         case GFX_LINK_TYPE_NATIVE_BMP:
             aExtension = "bmp";
             break;
+        case GFX_LINK_TYPE_NATIVE_SVG:
+            aExtension = "svg";
+            break;
         default:
             break;
     }

svx/source/xoutdev/_xoutbmp.cxx

@@ -231,7 +231,7 @@ sal_uInt16 XOutBitmap::WriteGraphic( const Graphic& rGraphic, OUString& rFileNam
 
             if( GRFILTER_FORMAT_NOTFOUND == nFilter )
             {
-                nFilter = rFilter.GetExportFormatNumberForShortName( FORMAT_JPG );
+                nFilter = rFilter.GetExportFormatNumberForShortName( FORMAT_PNG );
 
                 if( GRFILTER_FORMAT_NOTFOUND == nFilter )
                     nFilter = rFilter.GetExportFormatNumberForShortName( FORMAT_BMP );