+2012-04-29 Eli Zaretskii <eliz@gnu.org>
+
+ * xdisp.c (pos_visible_p): If already at a newline from the
+ display string before the 'while' loop, don't walk back the glyphs
+ from it3.glyph_row. Solves assertion violation when the display
+ string begins with a newline (egg.el). (Bug#11367)
+
2012-04-24 Chong Yidong <cyd@gnu.org>
* xselect.c (x_convert_selection): Initialize a pointer (Bug#11315).
Lisp_Object startpos, endpos;
EMACS_INT start, end;
struct it it3;
+ int it3_moved;
/* Find the first and the last buffer positions
covered by the display string. */
begins. */
start_display (&it3, w, top);
move_it_to (&it3, -1, 0, top_y, -1, MOVE_TO_X | MOVE_TO_Y);
+ /* If it3_moved stays zero after the 'while' loop
+ below, that means we already were at a newline
+ before the loop (e.g., the display string begins
+ with a newline), so we don't need to (and cannot)
+ inspect the glyphs of it3.glyph_row, because
+ PRODUCE_GLYPHS will not produce anything for a
+ newline, and thus it3.glyph_row stays at its
+ stale content it got at top of the window. */
+ it3_moved = 0;
/* Finally, advance the iterator until we hit the
first display element whose character position is
CHARPOS, or until the first newline from the
if (IT_CHARPOS (it3) == charpos
|| ITERATOR_AT_END_OF_LINE_P (&it3))
break;
+ it3_moved = 1;
set_iterator_to_next (&it3, 0);
}
top_x = it3.current_x - it3.pixel_width;
display string, move back over the glyphs
produced from the string, until we find the
rightmost glyph not from the string. */
- if (IT_CHARPOS (it3) != charpos && EQ (it3.object, string))
+ if (it3_moved
+ && IT_CHARPOS (it3) != charpos && EQ (it3.object, string))
{
struct glyph *g = it3.glyph_row->glyphs[TEXT_AREA]
+ it3.glyph_row->used[TEXT_AREA];