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moving: don't try to redraw lines that have gone outside the viewport
Benno Schulenberg authored
When scrolling backward, it is not just the bottom line of the screen
that doesn't need to be redrawn: also the line /before/ the top line
doesn't need a redraw.  Mutatis mutandis for scrolling forward.

This fixes https://savannah.gnu.org/bugs/?50657.
9cf98070
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