[FIX] sap.m.Dialog: tap on header (draggable) and rerender will no longer break the postion
[FIX] sap.m.Dialog: tap on header (draggable) and rerender will no longer break the postion

Change-Id: I01454d770adc6c560606f66b6930abb09ed3a63f
BCP: 1570837379

cschuff/openui5,cschuff/openui5,SAP/openui5,olirogers/openui5,cschuff/openui5,nzamani/openui5,olirogers/openui5,SAP/openui5,SQCLabs/openui5,SAP/openui5,olirogers/openui5,nzamani/openui5,SQCLabs/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5