[INTERNAL] sap.ui.rta: fix selection issue in IE
[INTERNAL] sap.ui.rta: fix selection issue in IE

Change-Id: Iae0fd96ab60974d2cb96fe73db56e1fb0cf2d5de
Signed-off-by: Kevin Edinger <2cd308f6e534f22a23b481bd971d726fce0a3425@sap.com>
BCP: 1780392608
nzamani/openui5,cschuff/openui5,nzamani/openui5,SAP/openui5,SQCLabs/openui5,SAP/openui5,SAP/openui5,cschuff/openui5,SQCLabs/openui5,SQCLabs/openui5,SAP/openui5,nzamani/openui5,cschuff/openui5