SCT: Show Sheet in New SCT [3]
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 7.2

With this third commit (on the SctUndockSheet2 branch), scrolling the new 
SCT to the same position as the sheet in the original SCT is better.

If a sheet other than the current sheet is being created, we attempt to scroll
only in the time dimension.  Vertical scrolling is precise, but because of a
limitation in the Qt API, horizontal scrolling is approximate.  Specifically,
the following method doesn't provide a way of indicating where the indicated
column should wind up within the visible view -- only a vertical placement
indication is supported.

  void QAbstractItemView::scrollTo (
    const QModelIndex&, ScrollHint hint = EnsureVisible);

I had attempted to implement scrolling at a lower level -- manipulating the
actual horizontal and vertical scrollbars.  But since rows and columns can be
hidden, the geometry calculations were very difficult to get right.

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