perf: avoid network wakeup when not needed

Author: ishland

src/main/java/com/ishland/vmp/mixins/networking/no_flush/MixinClientConnection.java

@@ -1,7 +1,14 @@
 package com.ishland.vmp.mixins.networking.no_flush;
 
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
 import io.netty.channel.Channel;
+import io.netty.channel.EventLoop;
+import io.netty.util.concurrent.AbstractEventExecutor;
 import net.minecraft.network.ClientConnection;
+import net.minecraft.network.PacketCallbacks;
+import net.minecraft.network.packet.Packet;
+import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Redirect;
@@ -14,4 +21,13 @@ private Channel dontFlush(Channel instance) {
         return instance; // no-op
     }
 
+    @WrapOperation(method = "sendImmediately", at = @At(value = "INVOKE", target = "Lio/netty/channel/EventLoop;execute(Ljava/lang/Runnable;)V"))
+    private void avoidImmediateExecute(EventLoop instance, Runnable runnable, Operation<Void> original, Packet<?> packet, @Nullable PacketCallbacks callbacks, boolean flush) {
+        if (!flush && instance instanceof AbstractEventExecutor executor) {
+            executor.lazyExecute(runnable);
+        } else {
+            original.call(instance, runnable);
+        }
+    }
+
 }