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Re: Question about display engine

From: Eli Zaretskii
Subject: Re: Question about display engine
Date: Sat, 07 Sep 2019 09:41:41 +0300

> Date: Sat, 7 Sep 2019 04:35:44 +0200
> From: Ergus <address@hidden>
> Cc: address@hidden, address@hidden
> In your solution I am facing an issue that I am not sure how to solve:
> I added a function handle_face_prop_general; that I call in
> extend_face_to_end_of_line but I get an inf loop because in the call
> stack I have:
> extend_face_to_end_of_line
> handle_face_prop_general
> face_at_buffer_position
> Fget_text_property
> Ftext_properties_at
> validate_interval_range
> That has a condition:
> if (!(BUF_BEGV (b) <= XFIXNUM (*begin)
>      && XFIXNUM (*begin) <= XFIXNUM (*end)
>      && XFIXNUM (*end) <= BUF_ZV (b)))
>       args_out_of_range (*begin, *end);
> And for some reason:
> XFIXNUM (*end) <= BUF_ZV (b) is false; so the function args_out_of_range
> emits a signal and never returns.

You need to understand how this happens.  What are the values of
*begin and *end in this case, and what is the position of the iterator
you pass to handle_face_prop_general?

> It is possible that in the first calls to extend_face_to_end_of_line the
> BUF_ZV (b) is not initialized yet?

No.  But please tell more about "the first call to
extend_face_to_end_of_line".  Which code calls it, and for what

> Because it is always 1. when I print it.

If BUF_ZV is 1, it's an empty buffer.

What is it->w->contents in your call?  It should be the buffer whose
text you are displaying.

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