[vim/vim] scroll: jump-scrolling when moving the cursor onto a wrapping line (PR #20895)

```
Problem:  With 'smoothscroll' and "lastline" in 'display', moving the cursor
          to a wrapping line scrolls much more than needed.
Solution: Only require the screen lines up to the cursor to be visible, the
          rest of the line can be cut off at the bottom.
```

related: #12411

---

With 'smoothscroll' and "lastline" in 'display', moving the cursor to a
wrapping line below the window scrolled far enough to show the whole line.
The first screen line of that line was already visible, so no scrolling was
needed.

Without "lastline" the line cannot be shown partially, so the behaviour there
is unchanged.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20895

-- Commit Summary --

  * scroll: jump-scrolling when moving the cursor onto a wrapping line

-- File Changes --

    M runtime/doc/todo.txt (3)
    M src/move.c (9)
    M src/testdir/test_scroll_opt.vim (20)

-- Patch Links --

https://github.com/vim/vim/pull/20895.patch
https://github.com/vim/vim/pull/20895.diff

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