UI: marking active / focussed cell by 'bordering' partly lost when autofilter active or rows hidden,
It's weird behavior, sometimes partly in the filtered area,
sometimes partly below, mostly right to the displayed data,
sometimes visible when scrolling up with the cursor key,
and hidden when scrolling down, mostly the color marking of
the column header is kept, while the marking of the row
number disappears or stays with wrong rows ...
In parallel the cell content isn't shown in the cell when
editing such cells ( F2 ), only in the formula bar.
might be dependent of somewhat bigger size of the filtered area!
related to #694 (closed) ??