Re: display.texi: (<line>,<col>) isn't documented.

[Richard Stallman]

    > Can you tell me how, in practice, you recognize from the displayed
    > length that the region is wrong?

    1. Small region of expected length: Equivalent of M-=. Check the length of a
    string of chars. Maybe select with the mouse - no need to hit the keyboard
    for M-=.

This does not explain how you can tell whether the length displayed
is right or wrong, or when that is useful.

    3. Large region: Be aware when the region is humongous (e.g. before you kill

That might be useful.

Perhaps it would be useful to display the size of the region
when the region is not entirely visible.