blindfold (from r.g.r.n)

Someone suggested that if your vision is only blocked by a blindfold and it's
the blindfold that glows, you should be able to see it.

include/youprop.h

@@ -100,6 +100,9 @@
 		 !(ublindf && ublindf->oartifact == ART_EYES_OF_THE_OVERWORLD))
 		/* ...the Eyes operate even when you really are blind
 		    or don't have any eyes */
+#define Blindfolded_only (!Blinded && haseyes(youmonst.data) && Blindfolded && \
+		 !(ublindf && ublindf->oartifact == ART_EYES_OF_THE_OVERWORLD))
+		/* blind because of a blindfold, and *only* that */
 
 #define Sick			u.uprops[SICK].intrinsic
 #define Stoned			u.uprops[STONED].intrinsic

src/potion.c

@@ -1682,7 +1682,7 @@ dodip()
 	}
 	potion->in_use = TRUE;		/* assume it will be used up */
 	if(potion->otyp == POT_WATER) {
-		boolean useeit = !Blind;
+		boolean useeit = !Blind || (obj == ublindf && Blindfolded_only);
 		if (potion->blessed) {
 			if (obj->cursed) {
 				if (useeit)

src/pray.c

@@ -396,7 +396,7 @@ decurse:
 			return;
 		    }
 		    uncurse(otmp);
-		    if (!Blind) {
+		    if (!Blind || (otmp == ublindf && Blindfolded_only)) {
 			pline("%s %s.", what ? what :
 				(const char *)Yobjnam2(otmp, "softly glow"),
 			      hcolor(NH_AMBER));