[leookun]

In a reply's table that scrolls sideways, selecting went wrong:

• A drag from above the table to beside a row selected the whole table; one from below to beside a row selected none of it.
• After one drag across the table, a drag in a row out past the table's edge selected every row below it (Flutter's scroll view keeps, from one drag to the next, whether the drag began in it, and takes an edge past its side as past all of it).
• Copied, the cells ran together with nothing between them.

The table now has its own selection, the scroll view's off:

• An edge beside a row is at that row's end (or start): at the edge of what shows when the drag began in the table, which scrolls on toward it (stepped a frame at a time, not Flutter's auto-scroller, which spun without end in tests), else past all of the row.
• Copied, a row is a line and its cells are apart by tabs, as a spreadsheet takes them.

Tests: test/markdown_test.dart (new tables / selected cases). selection_scroll_test.dart's trackpad fling case fails on main as well.

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