When echo is off an icanon is on, indicate a password entry prompt

This is what Terminal does. It shows a dot in the block cursor.

I guess the scroll locked state could also have its own cursor: https://bugzilla.gnome.org/show_bug.cgi?id=755371

Milestone changed to Feature Complete 3.1

mentioned in issue #4330 (closed)

Milestone changed to Feature Complete 3.2

mentioned in issue #4961 (closed)

Mentioned in issue #5179 (closed)

mentioned in issue #5680

There is now an experimental flag to enable this in tomorrow's nightly build.