bug#64596: 30.0.50; On FIXME: in src/buffer.c:1481 (force-mode-line-update)

[Ihor Radchenko <yantar92@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> This does not help the confusion, unfortunately.
>> Or maybe the terms "redisplay" and "update" should be explained better
>> somewhere near the top of xdisp.c. They clearly have different meaning,
>> but not for untrained eye.
>
> "Update" is the general name of the 3rd step of "redisplay cycle".  It
> takes its name from the function which enters this step: update_frame.

May someone then detail these steps in the top commentary in xdisp.c +
highlight that redisplay term is generally used when deciding if we need
to update. And update is an actual process of putting desired matrix
onto the glass.

-- 
Ihor Radchenko // yantar92,
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