Ignore cursor jumping shortcuts with shift
Ignore cursor jumping shortcuts with shift

This tweaks the new cursor jumping shortcuts in the composer so that they only
activate without shift. When shift _is_ pressed, you want to extend the
selection instead of just moving.

Fixes https://github.com/vector-im/riot-web/issues/12549

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