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Re: Question about display engine

From: Ergus
Subject: Re: Question about display engine
Date: Sun, 13 Oct 2019 20:11:10 +0200
User-agent: NeoMutt/20180716

On Sun, Oct 13, 2019 at 08:04:02PM +0300, Eli Zaretskii wrote:
Date: Sun, 13 Oct 2019 18:44:24 +0200
From: Ergus <address@hidden>
Cc: address@hidden, address@hidden

>Could it be that redisplay_window_0, or some function it calls,
>signals an error, which is caught by internal_condition_case_1?  What
>happens if you put a breakpoint in signal_or_quit, does it get called
>from redisplay_window or some other function called by

Yes, actually:

#0  0x00005597732a0380 in signal_or_quit (error_symbol=0x2cd0, 
data=0x559775ee2633, keyboard_quit=false) at ../../src/eval.c:1586
#1  0x000055977314c308 in Fsignal (error_symbol=<optimized out>, 
error_symbol@entry=0x2cd0, data=<optimized out>) at ../../src/eval.c:1568
#2  0x000055977314c4c9 in xsignal (data=<optimized out>, error_symbol=0x2cd0) 
at ../../src/lisp.h:4139
#3  0x000055977314c4c9 in xsignal2 (error_symbol=error_symbol@entry=0x2cd0, 
arg1=<optimized out>, arg2=<optimized out>) at ../../src/eval.c:1713
#4  0x000055977314b76e in args_out_of_range (a1=<optimized out>, a2=<optimized 
out>) at ../../src/lisp.h:1032
#5  0x000055977314e97b in validate_interval_range (object=0x559775cee0d5, 
begin=0x7fff35ec34b8, end=0x7fff35ec34b8, force=<optimized out>) at 
#6  0x00005597732f4050 in Ftext_properties_at (position=<optimized out>, 
object=<optimized out>) at ../../src/textprop.c:572
#7  0x00005597732f40bc in Fget_text_property (position=<optimized out>, prop=0x5d30, 
object=<optimized out>) at ../../src/textprop.c:592
#8  0x00005597731f8eec in face_at_buffer_position
    (w=0x5597758e7620, pos=0, endptr=endptr@entry=0x7fff35ec3650, limit=100, 
mouse=mouse@entry=false, base_face_id=1, attr_filter=LFACE_EXTEND_INDEX)
    at ../../src/xfaces.c:6090

Then looking at the position that causes the error will probably tell
you what's wrong.  (Is OBJECT passed to Fget_text_property a string?
if not, position of zero is invalid.)

That's exactly the problem. IT_CHARPOS (*it), is returning zero in
face_at_pos and !STRINGP (it->string). Could you tell me whats going on

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