Briefly, scrolling using the arrow keys eventually scrolls the cursor off screen.
There's a user interface issue in this one. To make the bug happen ...
1. Leap anywhere.
2. Scroll either up or down.
3. When the cursor reaches the top of the Archy window, it moves out of sight
beyond the boundary of the window. There is NO CURSOR IN SIGHT at this point.
4. You can continue to scroll indefinitely with the cursor out of sight.
Again, this works when you scroll up or scroll down.
I may be wrong, but arrow key scrolling does not seem to be detailed in the Spec
(I searched on the term "scrolling" and on the term "arrow key"), which would
make this something for Jef to describe. On the Cat, the text would continue to
scroll, but the cursor would stay in view, attempting to maintain the same
columnar position unless the line were shorter than the column position of the
cursor, in which case it would move to the last character of the shorter line.
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