add back optimise non-flush packet sending patch

[wuangg]

There are reasons I can think of why the original patch was dropped:

1. Mojang made some code changes in order to optimize the networking performance in 1.20.2, as some of these changes were similar to a collection of patches had already existed in Paper, resulting in the removal of these patches.
2. AbstractEventExecutor.LazyRunnable had been deprecated since the release of Netty 4.1.92 (see Deprecates LazyRunnable netty/netty#13335)

Although there is an alternative mechanism provided from the API reference of AbstractEventExecutor, the solution in this PR only requires a small amount of code changes.

[Potothingi]

Has this been tested? I can't connect to the server.

[electronicboy]

it's a small change in which packets which need to get out fast are generally marked as such, and this is working fine here, however, I do test behind a bungee proxy

[wuangg]

Has this been tested? I can't connect to the server.

Oops.

Yes this has been tested and indeed was working, later I was testing out @electronicboy 's suggestion (which causes the player cannot connect to the server) and accidentally pushed that code change as I was out of focus for a bit.

The change has been reverted, now this PR should work fine just like at the beginning and I have to be careful next time. Thank you for hitting me up!

[Potothingi]

This patch broke the plugin that reads and modifies chat packets with ProtocolLib.

[wuangg]

This patch broke the plugin that reads and modifies chat packets with ProtocolLib.

Are there any log about this?

[electronicboy]

https://github.com/dmulloy2/ProtocolLib/blob/80aa42009981b505370b00dd71af6d4e41726f38/src/main/java/com/comphenix/protocol/injector/netty/channel/NettyEventLoopProxy.java

This is basically down to how they hook the event loop stuff

[wuangg]

It seems like I have to open a PR on ProtocolLib to make their event loop hook extending AbstractEventLoop. I still have another alternative approach but it would be too much in terms of code diffs

[wuangg]

Close this until I came up with a suitable solution.