Makes objects without moues opacity not appear via alt-click.

Prevents clicking objects you should not be able to click.

code/modules/mob/mob.dm

@@ -823,6 +823,8 @@ note dizziness decrements automatically in the mob's Life() proc.
 		else
 			statpanel(listed_turf.name, null, listed_turf)
 			for(var/atom/A in listed_turf)
+				if(!A.mouse_opacity)
+					continue
 				if(A.invisibility > see_invisible)
 					continue
 				if(is_type_in_list(A, shouldnt_see))