Foam can pass through tables and computers and grilles (#89636)

code/game/objects/effects/effect_system/fluid_spread/effects_foam.dm

@@ -39,6 +39,8 @@
 	. = ..()
 	if(slippery_foam)
 		AddComponent(/datum/component/slippery, 100)
+	if(HAS_TRAIT(loc, TRAIT_ELEVATED_TURF))
+		layer = WATER_LEVEL_LAYER
 	create_reagents(1000, REAGENT_HOLDER_INSTANT_REACT)
 	playsound(src, 'sound/effects/bubbles/bubbles2.ogg', 80, TRUE, -3)
 	AddElement(/datum/element/atmos_sensitive, mapload)
@@ -96,10 +98,14 @@
 				continue
 			if(turf_location.underfloor_accessibility < UNDERFLOOR_INTERACTABLE && HAS_TRAIT(object, TRAIT_T_RAY_VISIBLE))
 				continue
+			if (HAS_TRAIT(loc, TRAIT_ELEVATED_TURF) && !HAS_TRAIT(object, TRAIT_ELEVATING_OBJECT))
+				continue // Do expose tables, don't expose items on tables
 			reagents.expose(object, VAPOR, fraction)
 
 	var/hit = 0
 	for(var/mob/living/foamer in loc)
+		if (HAS_TRAIT(foamer, TRAIT_MOB_ELEVATED))
+			continue
 		hit += foam_mob(foamer, seconds_per_tick)
 	if(hit)
 		lifetime += ds_seconds_per_tick //this is so the decrease from mobs hit and the natural decrease don't cumulate.
@@ -137,6 +143,7 @@
 		return FALSE
 
 	var/datum/can_pass_info/info = new(no_id = TRUE)
+	info.pass_flags = PASSTABLE | PASSGRILLE | PASSMACHINE | PASSSTRUCTURE
 	for(var/iter_dir in GLOB.cardinals)
 		var/turf/spread_turf = get_step(src, iter_dir)
 		if(spread_turf?.density || spread_turf.LinkBlockedWithAccess(spread_turf, info))
@@ -149,6 +156,8 @@
 			continue
 
 		for(var/mob/living/foaming in spread_turf)
+			if (HAS_TRAIT(foaming, TRAIT_MOB_ELEVATED))
+				continue
 			foam_mob(foaming, seconds_per_tick)
 
 		var/obj/effect/particle_effect/fluid/foam/spread_foam = new type(spread_turf, group, src)