lit and unlit corridors

The default symbol for lit and unlit corridors are the same.  This makes
the lit_corridor option a no-op where the defaults are used and also means
that using a light scroll/spell a corridor has no obvious effect.  To
address that, I special-cased the lit corridor symbol and change its color
to bright white when its the same symbol as the unlit corridor symbol (I
didn't change the default color since I thought that made the lit corridor
look strange using the windows console interface).

doc/fixes34.3

@@ -117,6 +117,7 @@ Gnome: real extended command menu so all extended commands can be entered
 Gnome: ignore interrupts to avoid infinite loop in gnome library
 tty: avoid crash displaying quit inventory if inventory was already displayed
 tty: use "bold" in menu heading if available and requested
+tty: differentiate between default unlit and lit corridor symbols
 winCE: ensure orphaned lockfile is always deleted on single-user handhelds
 
 

src/drawing.c

@@ -225,7 +225,7 @@ const struct symdef defsyms[MAXPCHARS] = {
 	{'#', "tree",		C(CLR_GREEN)},	/* tree */
 	{'.', "floor of a room",C(CLR_GRAY)},	/* room */
 /*20*/	{'#', "corridor",	C(CLR_GRAY)},	/* dark corr */
-	{'#', "lit corridor",	C(CLR_GRAY)},	/* lit corr */
+	{'#', "lit corridor",	C(CLR_GRAY)},	/* lit corr (see mapglyph.c) */
 	{'<', "staircase up",	C(CLR_GRAY)},	/* upstair */
 	{'>', "staircase down",	C(CLR_GRAY)},	/* dnstair */
 	{'<', "ladder up",	C(CLR_BROWN)},	/* upladder */

src/mapglyph.c

@@ -121,6 +121,14 @@ unsigned *ospecial;
 	    else
 		color = NO_COLOR;
 	} else
+#endif
+#ifdef TEXTCOLOR
+	    /* provide a visible difference if normal and lit corridor
+	     * use the same symbol */
+	    if (iflags.use_color &&
+		offset == S_litcorr && ch == showsyms[S_corr])
+		color = CLR_WHITE;
+	    else
 #endif
 	    cmap_color(offset);
     } else if ((offset = (glyph - GLYPH_OBJ_OFF)) >= 0) {	/* object */