try_cursor_movement not called?

[Po Lu]

I thought that `try_cursor_movement' was the function in charge of
updating the cursor in straightforward situations where someone pressed
C-f to move forward, and the cursor did not move outside the window.

But if I insert the following text in a buffer:

ABCDEFG

Then move point to A and press C-f, the cursor moves to "B" but
try_cursor_movement is not called.

What am I missing?

Thanks.