Display inconsistent with actual buffer contents after keypress + file reload

[Pistos]

STR:

1. Open a file
2. Position the cursor somewhere specific
3. Make an external change to that file (outside of Diakonos)
4. Type a letter or some other character
5. See prompt to reload; answer (y)es.
6. See file reloaded, and typed letter apparently added to file.
7. Refresh display (Ctrl-Alt-R, or pan view with Ctrl-Up or Ctrl-Down).
8. Observe that typed character is not actually there.