[BRLTTY] Clearing display contents with BrlAPI

[Dave Mielke]

[quoted lines by Sébastien Hinderer on 2020/12/08 at 10:08 +0100]

>To clear the display you could use the writeDots method and pass it as
>many zeros as the display's size.

The idea, I think, is that the user shouldn't need to know the display's size
just to clear it.

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