TechDraw: DrawViewSpreadsheet do not create cyclic dependency

(cherry picked from commit eaee0f759a)

src/Mod/TechDraw/App/DrawViewSpreadsheet.cpp

@@ -143,7 +143,6 @@ std::string DrawViewSpreadsheet::getSVGTail()
 std::string DrawViewSpreadsheet::getSheetImage()
 {
     App::DocumentObject* link = Source.getValue();
-    link->recomputeFeature();   //make sure s/s is up to date
 
     std::string scellstart = CellStart.getValue();
     std::string scellend = CellEnd.getValue();
@@ -411,3 +410,4 @@ template<> const char* TechDraw::DrawViewSpreadsheetPython::getViewProviderName(
 // explicit template instantiation
 template class TechDrawExport FeaturePythonT<TechDraw::DrawViewSpreadsheet>;
 }
+