Re: Debugging printing to stderr prior glyph row values ....

[Eli Zaretskii]

> Date:  Thu, 23 May 2019 17:03:36 -0700
> From:  Keith David Bershatsky <address@hidden>
> Cc:  address@hidden
> 
> I got it to crash ... again.  "pgrowx previous_row" from gdb prints nothing 
> and returns to a new gdb command prompt.

This means the previous glyph row had its 'used' member equal to zero.

> [CAVEAT:  I wanted a crash, so I did not insert a test for the 'used' member 
> being greater than zero.]

And it shows:

> (gdb) print *previous_row
> $3 = {
>   glyphs = {0x11a800000, 0x11a800000, 0x11a803520, 0x11a803520},
>   used = {0, 0, 0, 0},

See? all of the 'used' members are zero.  IOW, there are no glyphs in
that row.