bug#60381: [PATCH] Preserve Window Position with Proced

[Eli Zaretskii]

> From: Laurence Warne <laurencewarne@gmail.com>
> Date: Wed, 28 Dec 2022 15:55:20 +0000
> 
> This patch addresses this by setting the window point (if applicable) 
> whenever a proced buffer is updated,
> and the second issue by not updating a proced buffer if it is not displayed 
> in any window.

I don't think I like the solution for the second issue, since it is a
backward-incompatible change.  It is not at all obvious that not
updating a proced buffer which isn't shown in a window is TRT.

Why cannot we simply save and restore point across updates?  If the
old value of point ends up in a slightly different position (because
many processes have died, for example), that is not a disaster.

Alternatively, record the process on whose line point was before the
update, and try to find the same process after update.