part3 of 3 for GitHub issue #1441

> Perhaps related: when a wand of sleep hits a disguised already-sleeping
> mimic (about which it is a separate question if they should go into
> disguise when sleeping, is it supposed to be automagic or conscious
> effort for them? but I digress), the mimic is not revealed (should it?)
> but the message says "hits a mimic".

Adjust restrap() so that a revealed mimic won't disguise itself while
sleeping. This seems to be in keeping with mimic lore.

Also, normal shop sounds (chime of register etc.) will wake a
mimic up from indeterminate sleep.

Closes #1441

include/extern.h

@@ -2920,6 +2920,8 @@ extern void globby_bill_fixup(struct obj *, struct obj *) NONNULLARG12;
 extern void credit_report(struct monst *shkp, int idx,
                           boolean silent) NONNULLARG1;
 extern void use_unpaid_trapobj(struct obj *, coordxy, coordxy) NONNULLARG1;
+extern void noisy_shop(struct mkroom *);
+
 
 /* ### shknam.c ### */
 

src/mon.c

@@ -4647,6 +4647,13 @@ restrap(struct monst *mtmp)
         return FALSE;
 
     if (mtmp->data->mlet == S_MIMIC) {
+        if (mtmp->msleeping || mtmp->mfrozen) {
+        /*
+         * The mimic needs to be awake to disguise itself
+         * as something else.
+         */
+            return FALSE;
+        }
         set_mimic_sym(mtmp);
         return TRUE;
     } else if (levl[mtmp->mx][mtmp->my].typ == ROOM) {

src/shk.c

@@ -1063,6 +1063,16 @@ tended_shop(struct mkroom *sroom)
     return !mtmp ? FALSE : (boolean) inhishop(mtmp);
 }
 
+void
+noisy_shop(struct mkroom *sroom)
+{
+    struct monst *mtmp = sroom->resident;
+
+    if (mtmp && inhishop(mtmp)) {
+        wake_nearto(mtmp->mx, mtmp->my, 11 * 11);
+    }
+}
+
 staticfn struct bill_x *
 onbill(struct obj *obj, struct monst *shkp, boolean silent)
 {

src/sounds.c

@@ -323,6 +323,7 @@ dosounds(void)
                 "the chime of a cash register.", "Neiman and Marcus arguing!",
             };
             You_hear1(shop_msg[rn2(2) + hallu]);
+            noisy_shop(sroom);
         }
         return;
     }