Fix redisplay bugs due to uninitialized glyphs.

Add diagnostics tools.

 dispnew.c (realloc_glyph_pool): Zero out newly allocated glyphs.
 msdos.c (IT_display_cursor): Log cursor position on termscript.
 .gdbinit (pgx): Display the avoid_cursor_p flag.

diff --cc src/ChangeLog
index d4df4268578d35e5d3bd30e5e2940c2c300caca7,9ceb19ad48666681a25f0b0068cd61770a055b3b..48968c0a97fe3dcebc82b4c290a1c040a74f639b
--- 1/src/ChangeLog
--- 2/src/ChangeLog
+++ b/src/ChangeLog
@@@ -1,78 -1,11 +1,86 @@@
+ 2010-08-06  Eli Zaretskii  <eliz@gnu.org>
+ 
+       * dispnew.c (realloc_glyph_pool): Zero out newly allocated glyphs.
+ 
+       * msdos.c (IT_display_cursor): Log cursor position on termscript.
+ 
+       * .gdbinit (pgx): Display the avoid_cursor_p flag.
+ 
 +2010-08-06  Juanma Barranquero  <lekktu@gmail.com>
 +
 +      * makefile.w32-in ($(BLD)/xdisp.$(O)): Update dependencies.
 +
 +2010-08-06  Jan Djärv  <jan.h.d@swipnet.se>
 +
 +      * xterm.h (x_get_focus_frame): Declare.
 +
 +      * keyboard.h (poll_for_input_1): Unconditionally declare.
 +
 +      * nsterm.h (x_set_menu_bar_lines): Declare.
 +
 +      * window.c: Don't include menu.h, it depends on lots of other .h-files.
 +
 +      * xfaces.c (x_create_gc, x_free_gc): Convert to ANSI C prototypes.
 +
 +      * window.c: Include menu.h.
 +
 +      * unexmacosx.c (print_region_list, print_regions)
 +      (build_region_list, find_emacs_zone_regions)
 +      (unexec_regions_merge, read_load_commands, dump_it)
 +      (unexec_init_emacs_zone): Convert to ANSI C prototypes.
 +
 +      * term.c: Check HAVE_SYS_IOCTL_H.
 +
 +      * sysdep.c: Check HAVE_TERM_H.
 +
 +      * process.c: Check HAVE_UTIL_H.  Include nsterm.h if HAVE_NS.
 +
 +      * nsterm.m (ns_init_paths, ns_alloc_autorelease_pool)
 +      (ns_ring_bell, ns_defined_color, hide_hourglass)
 +      (x_display_pixel_height, x_display_pixel_width, syms_of_nsterm):
 +      Convert to ANSI C prototypes.
 +      (x_set_window_size, ns_draw_fringe_bitmap, judge): Move declarations
 +      before code.
 +
 +      * nsterm.h : Include sysselect.h.
 +      (x_sync, x_get_focus_frame, x_set_mouse_position)
 +      (x_set_mouse_pixel_position, x_make_frame_visible)
 +      (x_make_frame_invisible, x_iconify_frame, x_char_width, x_char_height)
 +      (x_pixel_width, x_pixel_height, x_set_frame_alpha, x_set_tool_bar_lines)
 +      (x_activate_menubar, free_frame_menubar, ns_init_paths, ns_select)
 +      (syms_of_nsterm, syms_of_nsfns, syms_of_nsmenu, syms_of_nsselect):
 +      Declare.
 +
 +      * nsmenu.m (popup_activated, name_is_separator)
 +      (syms_of_nsmenu): Convert to ANSI C prototypes.
 +      (runMenuAt): Prototypes and move declarations before code.
 +
 +      * nsimage.m (ns_load_image): Move NSTRACE after declarations.
 +
 +      * nsfont.m (ns_fallback_entity, syms_of_nsfont): Convert to ANSI C
 +      prototypes.
 +
 +      * nsfns.m (have_menus_p, ns_display_info_for_name)
 +      (x_set_cursor_type, ns_appkit_version_str)
 +      (ns_appkit_version_int, ns_do_applescript)
 +      (x_set_scroll_bar_default_width, x_sync, compute_tip_xy)
 +      (syms_of_nsfns): Convert to ANSI C prototypes.
 +
 +      * menu.h (x_set_menu_bar_line): Declare.
 +      (free_menubar_widget_value_tree et.al): Add HAVE_NS for these functions.
 +
 +      * lisp.h (fmod_float): Declare.
 +
 +      * image.c (xpm_scan, xpm_make_color_table_v)
 +      (xpm_put_color_table_v, xpm_get_color_table_v)
 +      (xpm_make_color_table_h, xpm_put_color_table_h)
 +      (xpm_get_color_table_h, xpm_str_to_color_key, xpm_load_image)
 +      (xpm_load): Convert to ANSI C prototypes.
 +
 +      * emacs.c: Include nsterm.h if HAVE_NS.
 +
 +      * bidi.c (bidi_dump_cached_states): Fix fprintf warning.
 +
  2010-08-06  Dan Nicolaescu  <dann@ics.uci.edu>
  
        * process.c: Remove HAVE_SOCKETS #ifdefs inside #ifdef