When the pointer reaches the edge of the view during a drag (or leaves
the view entirely, which mouse capture makes possible), keep scrolling
and extending the selection: slowly on the innermost edge row, faster
on the outermost row, and very fast beyond. Scrolling starts after a
short delay so that a drag merely passing near the edge doesn't scroll.
When the view loses focus mid-drag (e.g. because a popup appeared),
cancel the autoscroll and the mouse capture.
I want to see how we go removing all retry logic within a test. Lazygit should be trusted to tell us when it's no longer busy,
and if it that proves false we should fix the issue in the code rather than being lenient in the tests