bug in `more -c` when displayed file has blank lines in certain places

[Benno Schulenberg <bensberg@xxxxxxxxxx>]

To reproduce, make it so that your terminal has 29 or 35 or 37 rows.
Then run `./more -c NEWS` and type ? to display the in-app help text.
(The NEWS file should be the one from util-linux-2.41-rc2.)

Then type <Space>.  See that the top row still displays the second line
of the help text: "Star (*) indicates argument becomes new default."

Somehow `more -c` forgets to clear the top row when the corresponding
line in the file is blank.

(Versions: 2.37.2 and 2.41-rc2.)


Benno

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