Re: try_cursor_movement not called?

[Eli Zaretskii]

On December 1, 2021 11:54:27 AM GMT+02:00, Po Lu <luangruo@yahoo.com> wrote:
> 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.
> 
> 

That's redisplay optimizations in action for you: there are optimizations we 
prefer before try_cursor_movement.

Assuming your Emacs was built with --enable-checking, invoke "M-x 
trace-redisplay" and look up in the code the optimizations it says it used.  
(You will want to disable blink-cursor-mode and eldoc, to avoid too many 
meaningless trace messages.)