showrace again...

I'm fairly sure that the 'showrace' and PC rogue cases are covered
correctly now despite the approximation in deciding whether the
specified glyph represents the hero.  However, I'm not sure how the
accessibility handling ought to work when the hero is not in normal
form.  Right now it kicks in if the glyph is any monster, so the
hero is visible as a monster (whether normal or poly'd or on steed).
It does not kick it when mimicking an object (after eating a mimic
corpse or being poly'd into a mimic and then hiding) or furniture
(only if poly'd into mimic) because execution won't make it into the
is_you block in that situation.  Same situation applies to setting
the MG_HERO flag bit, but that doesn't seem to be used anywhere.

src/display.c

@@ -2173,8 +2173,12 @@ map_glyphinfo(xchar x, xchar y, int glyph, unsigned mgflags,
     int offset;
     boolean is_you = (x == u.ux && y == u.uy
                       /* verify hero or steed (not something underneath
-                         when hero is invisible without see invisible) */
-                      && canspotself());
+                         when hero is invisible without see invisible,
+                         or a temporary display effect like an explosion);
+                         this is only approximate, because hero might be
+                         mimicking an object (after eating mimic corpse or
+                         if polyd into mimic) or furniture (only if polyd) */
+                      && glyph_is_monster(glyph));
     const glyph_map *gmap = &glyphmap[glyph];
 
     glyphinfo->gm = *gmap; /* glyphflags, symidx, color, tileidx */
@@ -2188,13 +2192,14 @@ map_glyphinfo(xchar x, xchar y, int glyph, unsigned mgflags,
      */
     if (is_you) {
 #ifdef TEXTCOLOR
-        if (!iflags.use_color || Upolyd) {
-            ; /* color tweak not needed (!use_color) or not wanted (Upolyd) */
+        if (!iflags.use_color || glyph != hero_glyph) {
+            ; /* color tweak not needed (!use_color) or not wanted (poly'd
+                 or riding--which uses steed's color, not hero's) */
         } else if (HAS_ROGUE_IBM_GRAPHICS
                    && g.symset[g.currentgraphics].nocolor == 0) {
             /* actually player should be yellow-on-gray if in corridor */
             glyphinfo->gm.color = CLR_YELLOW;
-        } else if (flags.showrace && glyph == hero_glyph) {
+        } else if (flags.showrace) {
             /* for showrace, non-human hero is displayed by the symbol of
                corresponding type of monster rather than by '@' (handled
                by newsym()); we change the color to same as human hero */