Re: emacs-21.1.94 crash in gnus on Windows

[Eli Zaretskii <eliz@gnu.org>]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Andy Moreton <andrewjmoreton@gmail.com>,  emacs-devel@gnu.org
> Date: Sat, 20 Mar 2010 16:45:45 +0100
> 
> I appears to happen when the last line in a buffer is made invisible
> with an elipsis spec (like the gnus-sum spec).

Last line in a buffer or last line on display?  Lines that are not
displayed should not be subject to any processing during redisplay.

> Apparently the code is accessing an uninitialized glyph row.

Do you mean that in the code below

	      if (TEXT_PROP_MEANS_INVISIBLE (prop) == 2)
		{
		  struct glyph_row *row = it.glyph_row;
		  struct glyph *glyph = row->glyphs[TEXT_AREA];
		  struct glyph *end = glyph + row->used[TEXT_AREA];
		  int x = row->x;

		  for (; glyph < end
			 && (!BUFFERP (glyph->object)
			     || glyph->charpos < charpos);
		       glyph++)
		    x += glyph->pixel_width;
		  top_x = x;
		}

it.glyph_row points to uninitialized memory?  That would be very
strange, since start_display and move_it_to, called just above this,
already worked on that glyph row.  Did I miss something?