Add support for italic text on ttys.

* src/dispextern.h: Replace unused TTY_CAP_BLINK with TTY_CAP_ITALIC.
(struct face): Remove unused fields tty_dim_p, tty_blinking_p, and
tty_alt_charset_p.  Add tty_italic_p.

* src/term.c: Support italics in capable terminals.
(no_color_bit): Replace unused NC_BLINK with NC_ITALIC.
(turn_on_face): Output using TS_enter_italic_mode if available.
Don't handle unused blinking and alt-charset cases.
(turn_off_face): Handle italic case; discard unused tty_blinking_p
and tty_alt_charset_p cases.
(tty_capable_p, init_tty): Support italics.

* src/termchar.h (struct tty_display_info): Add field for italics.
Remove unused blink field.

* src/xfaces.c (tty_supports_face_attributes_p, realize_tty_face):
Handle slant.

Fixes: debbugs:9652

1 files changed, 1 insertions, 1 deletions

diff --git a/src/termchar.h b/src/termchar.h
index d50ee805e03..102fe45350e 100644
--- a/src/termchar.h
+++ b/src/termchar.h
@@ -124,8 +124,8 @@ struct tty_display_info
                                    each as vpos and hpos) */
 
   const char *TS_enter_bold_mode; /* "md" -- turn on bold (extra bright mode).  */
+  const char *TS_enter_italic_mode; /* "ZH" -- turn on italics mode.  */
   const char *TS_enter_dim_mode; /* "mh" -- turn on half-bright mode.  */
-  const char *TS_enter_blink_mode; /* "mb" -- enter blinking mode.  */
   const char *TS_enter_reverse_mode; /* "mr" -- enter reverse video mode.  */
   const char *TS_exit_underline_mode; /* "us" -- start underlining.  */
   const char *TS_enter_underline_mode; /* "ue" -- end underlining.  */