This is a patch to fix: https://bugs.kde.org/show_bug.cgi?id=407473
From the bug report: Instead of disabling both the input field and the login button/action, just disable the login action, so that the user can continue to edit/retype the password while waiting for the timeout to expire. This way the user can save on some of the waiting time. Especially, by the time the user is done retyping, the timeout would have expired and the user can proceed to the login action.