[BRLTTY] brl.cursor and electric fence error report

[Jason White]

Test results with the latest revision:

When the cursor is to the right of the display in contracted mode, a braille
cursor representation appears on the last character of the display (where it
shouldn't). However, when the display window is advanced to the location of
the actual cursor, the cursor is presented correctly, in the right place.

If you can suppress the spurious cursor presentation on the last character of
the display when the actual cursor is to the right, you will have fixed this
particular bug correctly, and we can celebrate another success story.