Tweaks/fixes to flooding and zmimic.

code/controllers/subsystems/zcopy.dm

@@ -287,7 +287,7 @@ SUBSYSTEM_DEF(zcopy)
 		// Get the bottom-most turf, the one we want to mimic.
 		// Baseturf mimics act as false bottoms of the stack.
 		var/turf/Td = T
-		while (Td.below && !(Td.z_flags & ZM_MIMIC_BASETURF))
+		while (Td.below && !(Td.z_flags & (ZM_MIMIC_BASETURF|ZM_OVERRIDE)))
 			Td = Td.below
 
 		// Depth must be the depth of the *visible* turf, not self.
@@ -320,12 +320,6 @@ SUBSYSTEM_DEF(zcopy)
 		else if (T.mimic_underlay)
 			QDEL_NULL(T.mimic_underlay)
 
-		if(T.below?.flooded)
-			T.icon = 'icons/turf/exterior/water.dmi'
-			T.icon_state = "0"
-			T.color = COLOR_SILVER
-			continue
-
 		// Handle space parallax & starlight.
 		if (T.below.z_eventually_space)
 			T.z_eventually_space = TRUE

code/game/turfs/exterior/exterior_wall.dm

@@ -61,7 +61,7 @@ var/global/list/natural_walls = list()
 	var/static/list/exterior_wall_shine_cache = list()
 
 /turf/exterior/wall/flooded
-	flooded = TRUE
+	flooded = /decl/material/liquid/water
 	color = COLOR_LIQUID_WATER
 
 /turf/exterior/wall/examine(mob/user, distance, infix, suffix)

code/game/turfs/turf_fluids.dm

@@ -43,7 +43,6 @@
 		REMOVE_ACTIVE_FLUID_SOURCE(src)
 		fluid_update() // We are now floodable, so wake up our neighbors.
 
-/* Commented out pending zmimic updates going in.
 	update_flooding_zmimic(mapload)
 	if(!mapload)
 		if(above)
@@ -62,7 +61,6 @@
 		z_flags &= ~(ZM_OVERRIDE|ZM_NO_SHADOW)
 	if(!mapload && old_z_flags != z_flags || old_z_appearance != z_appearance)
 		update_above()
-*/
 
 /turf/is_flooded(var/lying_mob, var/absolute)
 	return (flooded || (!absolute && check_fluid_depth(lying_mob ? FLUID_OVER_MOB_HEAD : FLUID_DEEP)))