segmentation fault displaying etc/HELLO on Windows

["Juanma Barranquero" <lekktu@gmail.com>]

Scrolling seems to be quite fast now on Windows (not yet up to 22.X
levels, but much faster than before).

However, C-h H crashes Emacs:

Program received signal SIGSEGV, Segmentation fault.
0x011ea1ff in w32_compute_glyph_string_overhangs (s=0x82eaf0) at w32term.c:1194
1194          font->driver->text_extents (font, code, s->nchars, &metrics);
(gdb) bt
#0  0x011ea1ff in w32_compute_glyph_string_overhangs (s=0x82eaf0) at
w32term.c:1194
#1  0x010569a4 in draw_glyphs (w=0x2f4b800, x=444, row=0x2fd8428,
area=TEXT_AREA, start=0, end=57, hl=DRAW_NORMAL_TEXT,
    overlaps=0) at xdisp.c:20359
#2  0x01059339 in x_write_glyphs (start=0x32ba000, len=57) at xdisp.c:21819
#3  0x0115bafb in update_window_line (w=0x2f4b800, vpos=7,
mouse_face_overwritten_p=0x82f0ec) at dispnew.c:4453
#4  0x0115c6cc in update_window (w=0x2f4b800, force_p=0) at dispnew.c:4309
#5  0x0115ed86 in update_window_tree (w=0x2f4b800, force_p=0) at dispnew.c:4002
#6  0x01160574 in update_frame (f=0x2f4ba00, force_p=0,
inhibit_hairy_id_p=0) at dispnew.c:3930
#7  0x010474b1 in redisplay_internal (preserve_echo_area=<value
optimized out>) at xdisp.c:11854
#8  0x0108a279 in read_char (commandflag=1, nmaps=3, maps=0x82fb70,
prev_event=47511553, used_mouse_menu=0x82fc34, end_time=0x0)
    at keyboard.c:2680
#9  0x0108e8ca in read_key_sequence (keybuf=0x82fcd4, bufsize=30,
prompt=47511553, dont_downcase_last=0,
    can_return_switch_frame=1, fix_current_buffer=1) at keyboard.c:9406
#10 0x01091a3d in command_loop_1 () at keyboard.c:1646
#11 0x01019016 in internal_condition_case (bfun=0x10917af
<command_loop_1>, handlers=47575281, hfun=0x1088a16 <cmd_error>)
    at eval.c:1511
#12 0x01087d2b in command_loop_2 () at keyboard.c:1362
#13 0x010190c0 in internal_catch (tag=47571353, func=0x1087d08
<command_loop_2>, arg=47511553) at eval.c:1247
#14 0x0108885b in command_loop () at keyboard.c:1341
#15 0x01088baf in recursive_edit_1 () at keyboard.c:950
#16 0x01088d1a in Frecursive_edit () at keyboard.c:1012
#17 0x01002c41 in main (argc=2, argv=0xa92750) at emacs.c:1749

-- 
 Juanma