Re: Text Properties And Buffer Modification

[Eli Zaretskii]

> Date: Thu, 06 Dec 2018 10:07:46 +0100
> From: martin rudalics <address@hidden>
> CC: address@hidden, address@hidden
> 
>  >> I would have thought that buffer redisplay is triggered only by
>  >> bset_redisplay and BUF_COMPUTE_UNCHANGED which IIUC are called the
>  >> same way for overlays and text properties.  Am I wrong?
>  >
>  > Yes.  The display engine sometimes needs to know not only whether the
>  > buffer needs to be redisplayed, but also _why_.  Search xdisp.c for
>  > MODIFF, and you will see.
> 
> I have tried to but still don't see the difference (but for setting
> last_had_star).

What did you try, exactly?  And what kind of difference did you expect
to see?