[PATCH v4 0/1] MR2941: Prevent NULL pointer in editor_ensure_visible when retrieving row from cursor.

[Santino Mazza (＠tati1454)]

This is to prevent NULL pointers when creating a TextService with no rows in it.
This NULL pointers doesn't happen when creating a richedit windows, because
it sets an empty text when the richedit window procedure handles the WM_CREATE event.

--
  v4: riched20: Call ME_UpdateRepaint instead of editor_ensure_visible in set_selection.

https://gitlab.winehq.org/wine/wine/-/merge_requests/2941