After reinstalling this new version of gnome-screensaver, I notice that when I switch users the unlock screen for the original user appears and is then quickly replaced by the unlock screen for the switched user (as anticipated) - so it seems this new update successfully refreshes the screen.
After reinstalling this new version of gnome-screensaver, I notice that when I switch users the unlock screen for the original user appears and is then quickly replaced by the unlock screen for the switched user (as anticipated) - so it seems this new update successfully refreshes the screen.