bug#64440: 30.0.50; [PATCH] Highlight on non toolkit menu bar items

[Eli Zaretskii <eliz@gnu.org>]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: luangruo@yahoo.com,  stefankangas@gmail.com,  64440@debbugs.gnu.org
> Date: Mon, 11 Sep 2023 14:32:39 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> +  *x_end = *x_start;
> >> +  for (i = *h_start; i < *h_end; ++i)
> >> +    *x_end += row->glyphs[TEXT_AREA][i].pixel_width;
> >> 
> >> Here, I convert those limits from chars to pixels.
> >
> > What does this glyph_row look like?  Does it include several strings
> > one after the other or something?
> >
> > In general, we always test the index of a glyph in a glyph row against
> > glyphs[TEXT_AREA].used, and I'm worried that these tests are absent
> > from the code above.  Which is why I'm asking for more details about
> > the arrangement of the menu text in these glyph rows.
> 
> Hi,
> 
> Here's what a "p *row" returns right after the "row = MATRIX_ROW
> (w->current_matrix, *vpos);" line:
> 
> (gdb) p *row
> $9 = {
>   glyphs = {0xef4a19dd000, 0xef4a19dd000, 0xef4a19e0510, 0xef4a19e0510},
>   used = {0, 120, 0, 0},
>   hash = 221095522,
>   x = 0,
>   y = 0,
>   pixel_width = 840,
>   ascent = 11,
>   height = 13,
>   phys_ascent = 10,
>   phys_height = 12,
>   visible_height = 13,
>   extra_line_spacing = 0,
>   start = {
>     pos = {
>       charpos = 0,
>       bytepos = 0
>     },
>     overlay_string_index = 0,
>     string_pos = {
>       charpos = 0,
>       bytepos = 0
>     },
>     dpvec_index = 0
>   },
>   end = {
>     pos = {
>       charpos = 0,
>       bytepos = 0
>     },
>     overlay_string_index = 0,
>     string_pos = {
>       charpos = 0,
>       bytepos = 0
>     },
>     dpvec_index = 0
>   },
>   minpos = {
>     charpos = 0,
>     bytepos = 0
>   },
>   maxpos = {
>     charpos = 0,
>     bytepos = 0
>   },
>   overlay_arrow_bitmap = 0,
>   left_user_fringe_bitmap = 0,
>   right_user_fringe_bitmap = 0,
>   left_fringe_bitmap = 0,
>   right_fringe_bitmap = 0,
>   left_user_fringe_face_id = 0,
>   right_user_fringe_face_id = 0,
>   left_fringe_face_id = 0,
>   right_fringe_face_id = 0,
>   left_fringe_offset = 0,
>   right_fringe_offset = 0,
>   fringe_bitmap_periodic_p = false,
>   redraw_fringe_bitmaps_p = false,
>   enabled_p = true,
>   truncated_on_left_p = false,
>   truncated_on_right_p = false,
>   continued_p = false,
>   displays_text_p = false,
>   ends_at_zv_p = false,
>   fill_line_p = false,
>   indicate_empty_line_p = false,
>   contains_overlapping_glyphs_p = false,
>   full_width_p = true,
>   mode_line_p = false,
>   tab_line_p = false,
>   overlapped_p = false,
>   ends_in_middle_of_char_p = false,
>   starts_in_middle_of_char_p = false,
>   overlapping_p = false,
>   mouse_face_p = false,
>   ends_in_newline_from_string_p = false,
>   exact_window_width_line_p = false,
>   cursor_in_fringe_p = false,
>   ends_in_ellipsis_p = false,
>   indicate_bob_p = false,
>   indicate_top_line_p = false,
>   indicate_eob_p = false,
>   indicate_bottom_line_p = false,
>   reversed_p = false,
>   stipple_p = false,
>   continuation_lines_width = 0,
>   clip = 0x0
> }
> 
> Is that what you are looking for?

This gives some of the answers, but the command 'pgrow' (defined on
src/.gdbinit) would have done that better, and would also show the
glyphs themselves.  Can you show what 'pgrow' produces in this case?