make manual resizing follow cursor more accurately
make manual resizing follow cursor more accurately

by clearing flex-grow that was set based on the list size,
you don't want it to grow anymore but be exactly the size
you are giving it.

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