Solution : https://service.sap.com/sap/support/notes/1430056 (SAP Service marketplace login required)
Key words : 
textedit control class cl_gui_textedit, kernel patch belonging, exact patch numbers, support packages refer, negative line parameter, textedit control, line points, negative values, method go_to_line, automation trace
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace |