AsyncSendPlayerSuggestionsEvent Brigadier Event

Going to be used for ACF to be able to send Tooltips to client :)

This is after completions are calculated, to control what is sent to the client.

Paper-MojangAPI/src/main/java/com/destroystokyo/paper/event/brigadier/AsyncSendPlayerSuggestionsEvent.java

@@ -0,0 +1,77 @@
+package com.destroystokyo.paper.event.brigadier;
+
+import com.mojang.brigadier.suggestion.Suggestions;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Called when sending Suggestions to the client. Will be called asynchronously if a plugin
+ * marks the AsyncTabComplete event handled asynchronously, otherwise called synchronously.
+ */
+public class AsyncSendPlayerSuggestionsEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList handlers = new HandlerList();
+    private boolean cancelled = false;
+
+    private Suggestions suggestions;
+    private final String buffer;
+
+    public AsyncSendPlayerSuggestionsEvent(Player player, Suggestions suggestions, String buffer) {
+        super(player, !Bukkit.isPrimaryThread());
+        this.suggestions = suggestions;
+        this.buffer = buffer;
+    }
+
+    /**
+     * @return The input buffer sent to request these suggestions
+     */
+    public String getBuffer() {
+        return buffer;
+    }
+
+    /**
+     * @return The suggestions being sent to client
+     */
+    public Suggestions getSuggestions() {
+        return suggestions;
+    }
+
+    /**
+     * @param suggestions The suggestions to be sent to client if need to change them
+     */
+    public void setSuggestions(Suggestions suggestions) {
+        this.suggestions = suggestions;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    /**
+     * Cancels sending suggestions to the client
+     * {@inheritDoc}
+     */
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @NotNull
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}