From bb71efc2c927d007b7baf45344fb42a94fb51377 Mon Sep 17 00:00:00 2001
From: Matthew Miller <mnmiller1@me.com>
Date: Mon, 3 Aug 2020 20:46:13 +1000
Subject: [PATCH] Only freeze water source blocks.

---
 .../com/sk89q/worldedit/function/block/SnowSimulator.java  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/function/block/SnowSimulator.java b/worldedit-core/src/main/java/com/sk89q/worldedit/function/block/SnowSimulator.java
index 5f9a7eab67..c0e4df9896 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/function/block/SnowSimulator.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/function/block/SnowSimulator.java
@@ -34,6 +34,7 @@ public class SnowSimulator implements LayerFunction {
     private final BlockState snowBlock = BlockTypes.SNOW_BLOCK.getDefaultState();
 
     private final Property<Integer> snowLayersProperty = BlockTypes.SNOW.getProperty("layers");
+    private final Property<Integer> waterLevelProperty = BlockTypes.WATER.getProperty("level");
 
     private final Extent extent;
     private final boolean stack;
@@ -80,8 +81,10 @@ public boolean apply(BlockVector3 position, int depth) throws WorldEditException
         BlockState block = this.extent.getBlock(position);
 
         if (block.getBlockType() == BlockTypes.WATER) {
-            if (this.extent.setBlock(position, ice)) {
-                affected++;
+            if (block.getState(waterLevelProperty) == 0) {
+                if (this.extent.setBlock(position, ice)) {
+                    affected++;
+                }
             }
             return false;
         }