[PATCH v3 0/2] MR2941: riched20: Set empty text by default in CreateTextServices.

[Santino Mazza (＠tati1454)]

This is to prevent NULL pointers when creating a standalone text service
that doesn't have any text set and then using functions like EM_SETSEL.
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.

--
  v3: riched20: Check if row is null in editor_ensure_visible.
      riched20: Return NULL if no row is found in row_from_cursor.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2941