Fix being able to examine out-of-view turfs

code/modules/mob/mob.dm

@@ -293,6 +293,10 @@
 	set name = "Examine"
 	set category = "IC"
 
+	if(isturf(A) && !(sight & SEE_TURFS) && !(A in view(src)))
+		// shift-click catcher may issue examinate() calls for out-of-sight turfs
+		return
+
 	if(is_blind(src))
 		to_chat(src, "<span class='notice'>Something is there but you can't see it.</span>")
 		return