penguinolog / urwid / 42666629881

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Add a ListBox wheel mode that scrolls the view

ListBox, TreeListBox and Table take wheel="focus" | "view".
The default "focus" keeps moving the focus one row per notch.

- "view" scrolls the view one row per notch; the focus stays while one
  of its rows is in view, otherwise it moves as set_scrollpos moves it.
- A notch measures only the rows around the view, so its cost does not
  grow with the body, and unsized or wrap-around walkers work too.
- When the view cannot move one row, as when the cursor of the focus
  widget keeps it in place, the notch does what "focus" mode does.
- At either end of the list the notch is returned unhandled in both modes.

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