Co-authored-by: Roland Rabien <figbug@gmail.com>

This patch should resolve an issue introduced in
0ab30555fc where arrow keys and other
directional keys (home, end, page up, page down) stopped working as
expected.

With this patch in place,
- IME input in plugins should work correctly, including for languages
  with a selection palette (Japanese) and languages where multiple
  keypresses combine to a single character (Korean).
- Keyboard shortcuts should work (cut, copy, paste)
- Directional keys should work

When the host creates an IContextMenu, the initial refcount should be 1 rather than zero.

The default value of this property changed in Sonoma, but we still want
to use the old default.