Re: How to record the line number pixel width for each window.

[Eli Zaretskii]

> Cc: "address@hidden" <address@hidden>
> From: Keith David Bershatsky <address@hidden>
> Date: Fri, 6 Dec 2019 09:07:10 -0800
> 
> Thank you, Eli, for reading and responding to this thread.  Once the 
> redisplay cycle gets to the place where update_window is called, all 
> simulations performed by moving IT have already concluded, and update_window 
> is the launch-point for features 17684/22873.  I would be comfortable using 
> an existing instance of screen simulation and perform the essence of 
> line_number_display_width without launching a new session with start_display. 
>  The goal is to be as efficient as possible when storing the values so that 
> they are reliably accessible when update_window gets called.  My general 
> feeling is that update_window is not the place to do screen simulations 
> (moving IT) and running a _new_ instance of start_display for each window is 
> not efficient.
> 
> Is there an existing instance of a running simulation for each window 
> somewhere in xdisp.c where I could add the guts of line_number_display_width 
> without launching a new start_display; and, if so, some pointers on where 
> that might be located would be greatly appreciated?

I'm sorry, I don't understand the question.  What do you call
"simulation" in this context?