Flag componentWillUpdate as UNSAFE in MatrixChat
Flag componentWillUpdate as UNSAFE in MatrixChat

For https://github.com/vector-im/riot-web/issues/12877
matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk