Fire PlayerToggleFlightEvent. Fixes BUKKIT-1696

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -42,6 +42,7 @@ import org.bukkit.event.player.PlayerToggleSprintEvent;
 import org.bukkit.event.player.PlayerPortalEvent;
 import org.bukkit.event.inventory.*;
 import org.bukkit.event.inventory.InventoryType.SlotType;
+import org.bukkit.event.player.PlayerToggleFlightEvent;
 import org.bukkit.inventory.CraftingInventory;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.InventoryView;
@@ -1292,7 +1293,18 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
     }
 
     public void a(Packet202Abilities packet202abilities) {
-        this.player.abilities.isFlying = packet202abilities.b && this.player.abilities.canFly;
+        // CraftBukkit start
+        if (this.player.abilities.canFly && this.player.abilities.isFlying != packet202abilities.b) {
+            PlayerToggleFlightEvent event = new PlayerToggleFlightEvent(this.server.getPlayer(this.player), packet202abilities.b);
+            this.server.getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
+                this.player.abilities.isFlying = packet202abilities.b; // Actually set the player's flying status
+            }
+            else {
+                this.player.updateAbilities(); // Tell the player their ability was reverted
+            }
+        }
+        // CraftBukkit end
     }
 
     // CraftBukkit start