Custom Chat Completions API (#8212)

patches/api/0389-Custom-Chat-Completion-Suggestions-API.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Sat, 30 Jul 2022 11:23:11 -0400
+Subject: [PATCH] Custom Chat Completion Suggestions API
+
+
+diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
+index 3fcfe8651a9c422fa9c8ff77556477f1461424cf..b607c229cfb1e95b17b6a0073380089ef5e1b675 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -2570,6 +2570,25 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
+      * @throws IllegalArgumentException If the level is negative or greater than {@code 4} (i.e. not within {@code [0, 4]}).
+      */
+     void sendOpLevel(byte level);
++
++    /**
++     * Adds custom chat completion suggestions that the client will
++     * suggest when typing in chat.
++     *
++     * @param completions custom completions
++     */
++    void addAdditionalChatCompletions(@NotNull java.util.Collection<String> completions);
++
++    /**
++     * Removes custom chat completion suggestions that the client
++     * suggests when typing in chat.
++     *
++     * Note: this only applies to previously added custom completions,
++     * online player names are always suggested and cannot be removed.
++     *
++     * @param completions custom completions
++     */
++    void removeAdditionalChatCompletions(@NotNull java.util.Collection<String> completions);
+     // Paper end
+ 
+     // Spigot start

patches/server/0927-Custom-Chat-Completion-Suggestions-API.patch

@@ -0,0 +1,33 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Sat, 30 Jul 2022 11:23:05 -0400
+Subject: [PATCH] Custom Chat Completion Suggestions API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+index 9f34358dfcb95104c5bb9e63fbe295e6e049a55d..ef9c3a7b15a4901e1662e6d55504b9cbbb804ad3 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+@@ -654,6 +654,22 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+ 
+         this.getHandle().getServer().getPlayerList().sendPlayerPermissionLevel(this.getHandle(), level, false);
+     }
++
++    @Override
++    public void addAdditionalChatCompletions(@NotNull Collection<String> completions) {
++        this.getHandle().connection.send(new net.minecraft.network.protocol.game.ClientboundCustomChatCompletionsPacket(
++            net.minecraft.network.protocol.game.ClientboundCustomChatCompletionsPacket.Action.ADD,
++            new ArrayList<>(completions)
++        ));
++    }
++
++    @Override
++    public void removeAdditionalChatCompletions(@NotNull Collection<String> completions) {
++        this.getHandle().connection.send(new net.minecraft.network.protocol.game.ClientboundCustomChatCompletionsPacket(
++            net.minecraft.network.protocol.game.ClientboundCustomChatCompletionsPacket.Action.REMOVE,
++            new ArrayList<>(completions)
++        ));
++    }
+     // Paper end
+ 
+     @Override