Solution : https://service.sap.com/sap/support/notes/1368461 (SAP Service marketplace login required)
Key words :
-calendar navigator popup button painted, -datepicker focus management improved, -datepicker field painted, -datepicker shifts focus, -reload icon cut, terms cl_gui_calendar reason, support packages refer, exact patch numbers, -actual date cell, calendar control
Related Notes :
| 1238921 | SAP GUI for HTML: Drag and drop support |
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace |