QTableView: optimize selection when spans are presentHEADdev

If a span is selected, we used to assume that rows and columns might be
moved, and made a selection with a range for each cell in the span. This
resulted in very large selection models.

We already had optimized the case that we didn't have any moved rows or
columns, skipping the mapping for the respective (or, usually, both)
directions and just making a single range. Apply that same optimization
for the case where a span exists and intersects with the selection area.

Avoid code duplication by only updating the top/left/bottom/right values
depending on the configuration of the table, and then create the
selection based on those.

Adapt the test case; we now get a single range, even when a span is
present, and the range includes all cells included in the span. Add a
debug streaming operator in the test case, as there is none implemented
in QTableWidgetSelectionRange, to ease debugging. That operator can
become a hidden friend of QTableWidgetSelectionRange in a follow-up
commit.

Pick-to: 6.8 6.7 6.5
Fixes: QTBUG-119076
Change-Id: If699463944ca2abaed8f93a2cd3ea30f33b79145
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

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