Precalculate all needed tokens and use indexing

Change-Id: If83e1b89e0116f0b20549daf839bd24621c926be
Reviewed-on: https://gerrit.libreoffice.org/67647
Tested-by: Jenkins
Reviewed-by: Matteo Casalin <matteo.casalin@yahoo.com>

sd/source/ui/func/fudraw.cxx

@@ -900,11 +900,15 @@ bool FuDraw::SetHelpText(SdrObject* pObj, const Point& rPosPixel, const SdrViewE
                 else
                 {
                     OUString sBookmark( pInfo->GetBookmark() );
-                    aHelpText += sBookmark.getToken( 2, '.' );
+                    sal_Int32 nIdx{ 0 };
+                    const OUString s0{ sBookmark.getToken( 0, '.', nIdx ) };
+                    const OUString s1{ sBookmark.getToken( 0, '.', nIdx ) };
+                    const OUString s2{ sBookmark.getToken( 0, '.', nIdx ) };
+                    aHelpText += s2;
                     aHelpText += ".";
-                    aHelpText += sBookmark.getToken( 1, '.' );
+                    aHelpText += s1;
                     aHelpText += ".";
-                    aHelpText += sBookmark.getToken( 0, '.' );
+                    aHelpText += s0;
                 }
             }
             break;