SuProcess: Disable echo in the PTY before starting sudo
Recent versions of sudo have use_pty enabled by default, which means that sudo creates a PTY for starting the user process inside after successful authentication. This PTY inherits the configuration of sudo's TTY, but later changes are not transferred. Make sure that echo is already disabled when sudo is started, as disabling it later has no effect on the nested PTY.
Edited by Fabian Vogt