Fix arrows keys moving through edit history
Fix arrows keys moving through edit history

Different fix that fixes https://github.com/vector-im/riot-web/issues/11817
by setting the flag before the callback rather than having the update
method set the flag.

Regressed in https://github.com/matrix-org/matrix-react-sdk/pull/3842
Fixes https://github.com/vector-im/riot-web/issues/11917

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