[FIX] sap.m.TextArea: Stop textarea "jumping" on counter update
[FIX] sap.m.TextArea: Stop textarea "jumping" on counter update

The textarea was jumping due counter's text length

Change-Id: Id098c5657941f27eb066d55c982a67f3a9a29179
BCP: 1870336325

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5