Add an event similar to PlayerEvent.NameFormat but for the name shown in the tab list. (#7740)

src/main/java/net/minecraftforge/event/ForgeEventFactory.java

@@ -260,6 +260,13 @@ public class ForgeEventFactory
         MinecraftForge.EVENT_BUS.post(event);
         return event.getDisplayname();
     }
+    
+    public static ITextComponent getPlayerTabListDisplayName(PlayerEntity player)
+    {
+        PlayerEvent.TabListNameFormat event = new PlayerEvent.TabListNameFormat(player);
+        MinecraftForge.EVENT_BUS.post(event);
+        return event.getDisplayName();
+    }
 
     public static BlockState fireFluidPlaceBlockEvent(IWorld world, BlockPos pos, BlockPos liquidPos, BlockState state)
     {

src/main/java/net/minecraftforge/event/entity/player/PlayerEvent.java

@@ -22,6 +22,7 @@ package net.minecraftforge.event.entity.player;
 import java.io.File;
 
 import net.minecraft.entity.item.ItemEntity;
+import net.minecraft.entity.player.ServerPlayerEntity;
 import net.minecraft.inventory.IInventory;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.RegistryKey;
@@ -39,6 +40,7 @@ import net.minecraftforge.event.entity.living.LivingEvent;
 import net.minecraftforge.eventbus.api.Event;
 
 import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
 
 /**
  * PlayerEvent is fired whenever an event involving Living entities occurs. <br>
@@ -180,6 +182,43 @@ public class PlayerEvent extends LivingEvent
         }
     }
 
+    /**
+     * TabListNameFormat is fired when a player's display name for the tablist is retrieved.<br>
+     * This event is fired whenever a player's display name for the tablist is retrieved in
+     * {@link ServerPlayerEntity#getTabListDisplayName()} or {@link ServerPlayerEntity#refreshTabListName()}.<br>
+     * <br>
+     * This event is fired via the {@link ForgeEventFactory#getPlayerTabListDisplayName(PlayerEntity)}.<br>
+     * <br>
+     * {@link #getDisplayName()} contains the display name of the player or null if the client should determine the display name itself.
+     * <br>
+     * This event is not {@link net.minecraftforge.eventbus.api.Cancelable}.
+     * <br>
+     * This event does not have a result. {@link HasResult}
+     * <br>
+     * This event is fired on the {@link MinecraftForge#EVENT_BUS}.
+     **/
+    public static class TabListNameFormat extends PlayerEvent
+    {
+        @Nullable
+        private ITextComponent displayName;
+
+        public TabListNameFormat(PlayerEntity player)
+        {
+            super(player);
+        }
+        
+        @Nullable
+        public ITextComponent getDisplayName()
+        {
+            return displayName;
+        }
+
+        public void setDisplayName(@Nullable ITextComponent displayName)
+        {
+            this.displayName = displayName;
+        }
+    }
+
     /**
      * Fired when the EntityPlayer is cloned, typically caused by the network sending a RESPAWN_PLAYER event.
      * Either caused by death, or by traveling from the End to the overworld.