cleanup filtered sign text (#7777)

patches/server/0902-Sign-cleanup-filtering.patch

@@ -0,0 +1,38 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sat, 30 Apr 2022 00:38:57 +0100
+Subject: [PATCH] Sign cleanup filtering
+
+TODO: This logic here should be moved into a DataFixer in the next MC release
+noting to ensure to apply the cleanup logic here, and clean up the added
+tags
+
+diff --git a/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
+index 6371176fba41218a209ea59b4cafe5b2d4a685fd..d5bcc81a809e3c733c6fc11309bcf0913860edf6 100644
+--- a/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
++++ b/src/main/java/net/minecraft/world/level/block/entity/SignBlockEntity.java
+@@ -72,6 +72,7 @@ public class SignBlockEntity extends BlockEntity implements CommandSource { // C
+         }
+         // CraftBukkit end
+ 
++        nbt.putBoolean("Paper.cleanedFiltered", true); // Paper
+         nbt.putString("Color", this.color.getName());
+         nbt.putBoolean("GlowingText", this.hasGlowingText);
+     }
+@@ -88,6 +89,7 @@ public class SignBlockEntity extends BlockEntity implements CommandSource { // C
+         boolean oldSign = Boolean.getBoolean("convertLegacySigns") && !nbt.getBoolean("Bukkit.isConverted");
+         // CraftBukkit end
+ 
++        boolean cleanedFiltered = nbt.getBoolean("Paper.cleanedFiltered"); // Paper
+         for (int i = 0; i < 4; ++i) {
+             String s = nbt.getString(SignBlockEntity.RAW_TEXT_FIELD_NAMES[i]);
+             // CraftBukkit start
+@@ -105,7 +107,7 @@ public class SignBlockEntity extends BlockEntity implements CommandSource { // C
+             this.messages[i] = ichatbasecomponent;
+             String s1 = SignBlockEntity.FILTERED_TEXT_FIELD_NAMES[i];
+ 
+-            if (nbt.contains(s1, 8)) {
++            if (cleanedFiltered && nbt.contains(s1, 8)) { // Paper
+                 this.filteredMessages[i] = this.loadLine(nbt.getString(s1));
+             } else {
+                 this.filteredMessages[i] = ichatbasecomponent;