This patch aims to ensure that MCP World#getNearestAttackablePlayer
will not trigger chunk loads due to PathfinderGoalNearestAttackableTarget
performing a ray trace operation by pre-checking the maximum limit;
Given that the implementation shows that the limit should only ever
decrease when set, allowing us to skip further checks earlier on
when looking for an attackable entity
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
9a793cce Remove no longer applicable caveats to setPlayerListName
7137829e SPIGOT-4496: Undeprecate MapView.getId and make int
de33ade0 Remove some draft API designations
a35fa838 SPIGOT-4472: Add Consumer scheduler methods
CraftBukkit Changes:
8cd538e6 SPIGOT-4498: Crash on startup
b4ee04ba SPIGOT-4496: Undeprecate MapView.getId and make int
ec937d0e SPIGOT-4472: Add Consumer scheduler methods
Spigot Changes:
a1f2566f Use monotonic time for watchdog
bc4adcbf SPIGOT-4498: Crash on startup
bb387e6c Rebuild patches
Now properly serializes and deserializes, is factored into hashcodes and
equality checks, etc
Deprecates the old Material based system and replaces it with a new one
based around NamespacedKeys and NamespacedTags. This allows the API to
extend beyond vanilla and Material enum based properties to datapack
based tags and elements.
Fixes GH-1635
Entities must be dismounted before teleportation in order to avoid
multiple issues in the server with regards to teleportation, shamefully,
too many plugins rely on the events firing, which means that not firing
these events caues more issues than it solves;
In order to counteract this, Entity dismount/exit vehicle events have
been modified to supress cancellation (and has a method to allow plugins
to check if this has been set), noting that cancellation will be silently
surpressed given that plugins are not expecting this event to not be cancellable.
This is a far from ideal scenario, however: given the current state of this
event and other alternatives causing issues elsewhere, I believe that
this is going to be the best soultion all around.
Improvements/suggestions welcome!
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
3aee9dbd Add Material BlockData to JavaDocs
--- work/Bukkit
Submodule work/Bukkit 1627782b..67e91ef7:
> Fix some incorrectly handled JavaDoc
> SPIGOT-4478: Update PlayerLoginEvent docs
> Add API to manipulate boss bar of entities and those created by commands
--- work/CraftBukkit
Submodule work/CraftBukkit ca22de36..3a911828:
> SPIGOT-4477: Arrows only firing direction of boat
> SPIGOT-4478: NPE during PlayerLoginEvent recipe manipulation
> Add API to manipulate boss bar of entities and those created by commands
--- work/Spigot
Submodule work/Spigot 2474d93d..947a8e7f:
> Rebuild patches
This change closes the plugin via the plugin manager, which disables
the plugin, as intended, but also cleans up after the plugin, preventing
any further errors or issues caused by tasks scheduled by the plugin before
it failed.
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
9d0221aa API to get client side view distance.
9be7f0ea SPIGOT-4395: Additions to PlayerBedEnterEvent.
01e534c6 Minor cosmetic cleanups to imports etc
CraftBukkit Changes:
96c461b3 API to get client side view distance.
e2785f4e Remove note about development build
a8000588 SPIGOT-4395: Additions to PlayerBedEnterEvent.
Spigot Changes:
117d4f7e Rebuild patches
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
162807b3 Remove some draft API designations
1) Get rid of string interning. can be heavy, has been seen to cause issues for some users
2) Use ConcurrentHashMap instead of a SynchronizedMap
3) Stop use of MRUMapCache which is not thread safe for Group lookups
4) Stop using IdentityHashMap which has performance issues in Java 8
These methods are used internally throughout the game for things like spawning mobs during day/night only or making them burn in daylight, etc. Now exposed for plugin usage.
This adds a plethora of useful Tags to let you identify common grouping
of materials. This should complete all of the categories that mojang
did not provide official tags for plus some more.
These are not "registered" tags. They are not usable in any form of
command system that might support tags.
These are provided as a Paper maintained list of items so that plugins
do not have to worry about maintaining all these tags themselves.
This API can technically be copy and pasted into a plugin, and plugins
can add additional Tags's if they wish too to their plugin by
instantiating a MaterialSetTag.
These deps were marked as provided, not compile, so they were never
exposed to plugins anyways as we THOUGHT we had done, oops.
Well plugins can still add fastutil to their build and use the
deps as provided by minecraft.
This ensures -api side does not use a deprecated API as fastutil 8
removed the deprecated methods.
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
867794b2 Make setPersistent also control player saving
CraftBukkit Changes:
02518f92 Make setPersistent also control player saving
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
c71bb9ca Add PlayerRecipeDiscoverEvent and methods to (un/)discover recipes
CraftBukkit Changes:
7a2f4867 Implement PlayerRecipeDiscoverEvent and methods to (un/)discover recipes
In Java 11 the internal reflection method used to determine the calling
class in the legacy and deprecated Timings API, that no one should be
using anymore, was removed.
This means plugins that try and use it will all fail to enable and we
can't compile the server with JDK 11.
The solution to the removal of this internal reflection class is
to just use reflection to call it if its available and fall back to
the unnamed handler system if it isnt.
Update to the newer API if you use Timings already...
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
39ce5d3a SPIGOT-4399: ItemMeta.equals broken with AttributeModifiers
CraftBukkit Changes:
1cf8b5dc SPIGOT-4400: Populators running on existing chunks
116cb9a1 SPIGOT-4399: Add attribute modifier equality test
5ee1c18a SPIGOT-4398: Set ASM7_EXPERIMENTAL flag
Upstream has released updates that appears to apply and compile correctly.
This update has been tested to ensure that World Conversion still occurs correctly.
Bukkit Changes:
0812ce2c SPIGOT-4397: isChunkGenerated API
CraftBukkit Changes:
4824655c SPIGOT-4398: Upgrade to ASM 6.2.1 for better Java 11 support
eea43870 MC-134115: Fix issues converting tile entities
1a7f2d10 SPIGOT-4397: isChunkGenerated API
40aed54d SPIGOT-4396: Improve vehicle movement
Spigot Changes:
f6a273b1 Rebuild patches
Apparently a zero max health attribute is perfectly fine in vanilla and
our own revive handling code appears to handle the case fine, even when
EntityDeathEvent is cancelled. So we should allow it to avoid issues
when these mobs are killed.
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
b9620fd9 API to generate filled explorer maps
CraftBukkit Changes:
c1ecaa2f API to generate filled explorer maps
This adds a new Future based, Consumer<Chunk> based, and ability
to control whether or not to generate to the Async Chunk API.
Until Async Chunks merges, these API's are still synchronous, but
this commit will allow plugins to start using the API's in use
with the Async Chunks beta.
This event extends the PreCreatureSpawnEvent and includes the position
of the spawner that spawned the entitiy. (similarly to how the
SpawnerSpawnEvent contains the spawner's BlockState).
This one doesn't include the state though as getting the block and
generating that snapshot is a bit wasteful.
Modifying of permissions was only half protected, enabling concurrency
issues to occur if permissions were modified async.
While no plugin really should be doing that, modifying operations
are not heavily called, so they are safe to add synchronization to.
Now, all modification API's will be synchronized ensuring safety.
Additionally, hasPermission was victim to a common java newbie mistake
of calling if (containsKey(k)) return get(k), resulting in 2 map lookups.
Optimized it to simply be a single get call cutting permission map
lookups in half.
Adds an API to allow plugins to instruct a Mob to Pathfind to a Location or Entity
This does not do anything to stop other AI rules from changing the location, so
it is still up to the plugin to control that or override after another goal changed
the location.
Adds an API to allow plugins to instruct a Mob to Pathfind to a Location or Entity
This does not do anything to stop other AI rules from changing the location, so
it is still up to the plugin to control that or override after another goal changed
the location.
The PluginManager incorrectly used synchronization on firing any event
that was marked as synchronous.
This synchronized did not even protect any concurrency risk as
handlers were already thread safe in terms of mutations during event
dispatch.
The way it was used, has commonly led to deadlocks on the server,
which results in a hard crash.
This change removes the synchronize and adds some protection around enable/disable
This method will return the Block a player is looking at while taking into consideration the AABB of each block in the path.
For example, you can look through the 1/4 space of air in a Stair block and get the block behind it instead of the Stair block you are looking past.
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
8ab814cd Add getFacing method to get the current cardinal direction an entity is facing.
CraftBukkit Changes:
ee5efeb0 Add getFacing method to get the current cardinal direction an entity is facing.
Spigot Changes:
0ede7d0e Rebuild patches
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
eaf05a2a Expand Recipe API to allow multiple Materials per slot
CraftBukkit Changes:
4c219e2a Expand Recipe API to allow multiple Materials per slot
With 1.13, the idea of accessing chunks async is going to have to
be supported with the push towards thread safe chunk access mojang
has done.
This commit changes timings to always thread check at start and stop
timings and only mutate state on main thread.
This makes startTimingIfSync pointless, but I'm just going to leave
it as is.
Timings will no longer complain when used async, it just will not
do anything.
Further concurrency issues have been addressed with creating
timings handlers that may of overall been an issue for any handler
that might of been created async (happened even for things that
only timed sync)
with that, the 'protected' concept of handlers has been removed,
and 'plugin' vs 'safe' handlers are now the same.
Got rid of some guava functions in favor of java 8 real stuff now too.
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
28237f03 SPIGOT-4330: Improve isSimilar for legacy stacks
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
aa81efb0 Remove some additional draft API markings
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
410a601d SPIGOT-4313: Unsupported plugin should not crash server
CraftBukkit Changes:
f5985747 SPIGOT-4313: Unsupported plugin should not crash server
Updated Upstream (Bukkit/CraftBukkit/Spigot)
Bukkit Changes:
2dcc44dc SPIGOT-4307: Fix hacky API for banners on shields
e0fc6572 SPIGOT-4309: Add "forced" display of particles
efeeab2f Add index to README.md for easier navigation
f502bc6f Update to Minecraft 1.13.1
CraftBukkit Changes:
d0bb0a1d Fix some tests randomly failing
997d378d Fix client stall in specific teleportation scenarios
b3dc2366 SPIGOT-4307: Fix hacky API for banners on shields
2a271162 SPIGOT-4301: Fix more invalid enchants
5d0d83bb SPIGOT-4309: Add "forced" display of particles
a6772578 Add additional tests for CraftBlockData
ce1af0c3 Update to Minecraft 1.13.1
Spigot Changes:
2440e189 Rebuild patches
4ecffced Update to Minecraft 1.13.1
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
23c1a2ba Deprecate ItemStack durability methods in favour of ItemMeta Damageable as they are being frequently used incorrectly.
Replaces PR #1161 for 1.13
Resolves#930
Adds new slime pathfinder related events. All events can be cancelled.
- `SlimePathfindEvent` is the base event of all added events. Cancelling this event will cancel all pathfinders.
- `SlimeWanderEvent` is called when slimes wander around by either swimming or moving/jumping forward. Cancelling this event will prevent slimes from moving around and jumping, but they will still look around and target players.
- `SlimeSwimEvent`is called when slimes are swimming in water/lava. Cancelling will prevent the slimes from moving/jumping in water/lava.
- `SlimeChangeDirectionEvent` is called when a slime changes directions. It contains the new `yaw` position the slime wants to change to, and it can be set to another value. Cancelling this event will prevent slimes from changing directions (except for when targeting players).
- `SlimeTargetLivingEntityEvent` is called when a slime targets a player. NMS uses EntityLiving here so it is named this. Contains the LivingEntity the slime has targeted. Cancelling this event will prevent the slime from targeting the entity and will make it lose current focus.
Adds `Slime#canWander()` and `Slime#setWander(boolean)` for a more persistent control (does not persist server restarts) over all 4 pathfinder types without the spammy event having to be cancelled a bajillion times a second.
Video demonstration: https://youtu.be/8hcLqazmO28
Test plugin: https://pastebin.com/cFgcgdWV
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
fd6a980a Fix PlayerInventory.setItem docs
The key can be retrieved via methods Location#toBlockKey() and
Block#getBlockKey()
World provides lookup for blocks by long key via method World#getBlockAtKey(long)
The formatting for the key is as follows:
10 bit y|27 bit z|27 bit x
The y value is considered unsigned while z and x are considered two's complement
Y range: [0, 1023]
X, Z range: [-67 108 864, 67 108 863]
Checked encoding and decoding via https://gist.github.com/Spottedleaf/74f4e241012ca2fa67d8f1c7e8e34722
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
f7662d5c SPIGOT-4283: Allow setting recipe groups
CraftBukkit Changes:
bfb91314 SPIGOT-4283: Allow setting recipe groups
* master:
Fix bug in last patch
Ensure chunks are always loaded on hard position sets
Improve Watchdog Early Warning Feature - Closes#1319
Allow disabling armour stand ticking
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
7ba8d633 SPIGOT-4265: Declare org.bukkit module
Particle packets contain a boolean which marks the particle to either force or show normal to the receiver.
Spigot has been sending all particles with the force boolean which overrides client particle settings.
Related changes in this commit;
- Add a force option to the ParticleBuilder API, which defaults to true to keep spigot consistent with existing api.
- Add a new spawnParticle method to support this mode as a parameter. Of course kept existing api methods the same so as to not break them.
Let me know if changes are needed.
I have tested that the Replenishing Feature still works as expected.
Lootable API's that now have Bukkit equivalents are now deprecated.
Bukkit Changes:
f0f33981 SPIGOT-1936: LootTable API
CraftBukkit Changes:
c0df4b82 SPIGOT-1936: LootTable API
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
c23d391f Update documentation of BlockPhysicsEvent
14fcd896 SPIGOT-4258: Add Player.updateCommands method
CraftBukkit Changes:
15da7067 SPIGOT-4258: Add Player.updateCommands method
Spigot Changes:
2b0e71c7 Rebuild patches
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
1f85e526 SPIGOT-4253: Add way to prioritise item conversion
CraftBukkit Changes:
96778caa SPIGOT-4253: Add way to prioritise item conversion
Upstream has added the equivalent of our SentientNPC API, with exception to the EnderDragon.
We've added Mob to the EnderDragon, and our SentientNPC API should behave the same.
Vex#getOwner has been deprecated and a replacement Vex#getSummoner has been added using Mob.
However, since 1.13 is not production ready, SentientNPC API is subject for removal in 1.13.1 since
1.13 API is not compatible with 1.12.
Please move to the Mob interface ASAP.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
c5ab54d8 Expand GameRule API
ab9a606c Improve entity hierarchy by adding Mob interface.
CraftBukkit Changes:
29e75648 Expand GameRule API
50e6858b Improve entity hierarchy by adding Mob interface.
0e1d79b4 Correct error in previous patch
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
6875ad8b Update documentation and status of command completion related events
0069113b Put the decompile fixes into MC Dev Fixes patch (Andrew Steinborn)
608b5e52 Optimize RegistryID.c() (Andrew Steinborn)
* pull/1257/head:
Put the decompile fixes into MC Dev Fixes patch
Optimize RegistryID.c()
This branch/commit is only useful to those who purely use a clean Bukkit/Spigot/Paper API
and does not use NMS/OBC references.
This will let you start updating your plugin to the latest 1.13 builds of Bukkit Preview (4 as of now)
Note that this release is not final!!! API breakages may occur!
It is up to you if you find use out of this work.
This enables us a fast reference to the entities current chunk instead
of having to look it up by hashmap lookups.
We also store counts by type to further enable other performance optimizations in later patches.
This is the best way to get an entity when the world and its UUID are known.
It is faster than Server.getEntity(UUID) because it does not have to iterate all worlds
This fixes a CRITICAL missing part of the Bukkit API due to mistakes on upstream
refusing to implement the Sentient NPC baseclass of all NPC's.
Until now, the Bukkit API has not provided a way for accessing and setting
a non creature entities target.
Although Flying, Slime, Ambient, and Water mobs all supported targets internally,
you were unable to get/set it.
Now with the SentientNPC API and these API's moved down, every sentient NPC has
access to target data.
This event is called when an entity receives knockback by another entity. The knockback can be modified in the event. If the event is cancelled the entity is not knocked back.
Called when a player is firing a bow and the server is choosing an arrow to use.
Plugins can skip selection of certain arrows and control which is used.
Used to determine ACTUAL Living NPC's. Spigot mistakenly inversed the conditions for LivingEntity, and
used LivingEntity for Insentient Entities, and named the actual EntityLiving class EntityInsentient.
This should of all been inversed on the implementation side. To make matters worse, Spigot never
exposed the differentiator that there are entities with AI that are not sentient/alive such as
Armor stands and Players are the only things that do not implement the REAL EntityLiving class (named Insentient internally)
This interface lets you identify NPC entities capable of sentience, and able to move about and react to the world.
Redirects are in place (or will be shortly). This is mostly
housekeeping.
Maven repo URLs already redirect however we can't deploy through them.
Jenkins URLs do not currently redirect but will within 24 hours.
Also adds a Discord link to the README, because apparently that's what
people want.
Documentation will be updated and announcements made once all redirects
are in place, until then, consider this advanced notice.
Adds ability to control who receives it and who is the source/sender (vanish API)
the standard API is to send the packet to everyone in the world, which is ineffecient.
This adds a new Builder API which is much friendlier to use.
Fires an event anytime an enderman intends to teleport away from the player
You may cancel this, enabling ranged attacks to damage the enderman for example.
Resolves#1101
It is often difficult to diagnose new issues server admins get when
upgrading to a new server version because the only information they are
able to tell us regarding the server version they are running is
"latest". This commit attempts to mitigate this by keeping track of the
previous version of Paper they were running, which is then reported by
the `/version` or `/paper version` command. This gives us a better idea
of the commits included in the upgrade, which may help diagnose new
issues easier.
It was using a redirect, but apparently a small portion of systems,
networks, some mess, are having problems with that redirect.
Just use the direct link and skip the hassle.
In some enviroments, the channel limit set by spigot can cause issues,
e.g. servers which allow and support the usage of mod packs.
provide an optional flag to disable this check, at your own risk.
* Make the legacy ping handler more reliable
The Minecraft server often fails to respond to old ("legacy") pings
from old Minecraft versions using the protocol used before the switch
to Netty in Minecraft 1.7.
Due to packet fragmentation[1], we might not have all needed bytes
available when the LegacyPingHandler is called. In this case, it will
run into an error, remove the handler and continue using the modern
protocol.
This is unlikely to happen for the first two revisions of the legacy
ping protocol (used in Minecraft 1.5.x and older) since the request
consists of only one or two bytes, but happens frequently for the
last/third revision introduced in Minecraft 1.6.
It has much larger, variable packet sizes due to the inclusion of
the virtual host (the hostname/port used to connect to the server).
The solution[2] is simple: If we find more than two matching bytes,
we buffer the remaining bytes until we have enough to fully read and
respond to the request.
[1]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h3-11
[2]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h4-13
* Add legacy ping support to PaperServerListPingEvent
Add a new method to StatusClient check if the client is a legacy
client that does not support all of the features provided in the
event.
Some plugins (e.g. older builds of EssentialsX) assume that
ServerListPingEvent.getSampleText() returns a mutable copy of
the player sample list. This was the case until it was refactored
on top of the new API introduced in #980.
As a result, they may run into an error when trying to modify the
returned list directly. Modify getSampleText() to return a mutable
copy (a plain ArrayList) to mimic the old behavior.
Don't want to risk mutating players properties in server list (unlikely, but lets be proper)
and Skull also has a setter API, so that should be used too.
* Drop original implementation for old player sample API
* Add extended PaperServerListPingEvent
Add a new event that extends the original ServerListPingEvent
and allows full control of the response sent to the client.
* Implement deprecated player sample API
I mistakenly thought .complete() also checked for textures, which was not the case
So the logic was not working as desired.
Also some undesired logic paths lead to textures of the logging in player being dropped, forcing
us to always load the textures immediately again on login, leading to rate limits.
Everythings now good
the .complete() api now will default specify to also complete textures, but you may
pass false to it to skip loading textures.
Gets the unique ID of the player currently known as the specified player name
In Offline Mode, will return an Offline UUID
This is a more performant way to obtain a UUID for a name than loading an OfflinePlayer
This is faster if all you need is the UUID, as .getOwner() will cause
an OfflinePlayer to be loaded from disk.
This method is already implemented on the server, just needed to expose it.
- Lots of itemstack cloning removed. Only clone if the item is actually moved
- Return true when a plugin cancels inventory move item event instead of false, as false causes pulls to cycle through all items.
However, pushes do not exhibit the same behavior, so this is not something plugins could of been relying on.
- Add option (Default on) to cooldown hoppers when they fail to move an item due to full inventory
- Skip subsequent InventoryMoveItemEvents if a plugin does not use the item after first event fire for an iteration
This is adds basic item meta for armor stands. It does not add all
possible metadata however.
There are armor, hand, and equipment types, as well as position data
that can also be added here. This initial implementation should serve as
a starting point for future additions in this area.
Fixes GH-559
Allows plugins to populate profile properties from local sources to avoid calls out to Mojang API
to fill in textures for example.
If Mojang API does need to be hit, event fire so you can get the results.
This is useful for implementing a ProfileCache for Player Skulls
This simply provides the base API to create the objects. Further commits will come that adds
adds usage of this API to existing GameProfile based API's, as well as new API's.
This event can be used for when you want to exclude a certain player
from triggering monster spawns on a server.
Also a highly more effecient way to blanket block spawns in a world
Adds an event to fire before an Entity is created, so that plugins that need to cancel
CreatureSpawnEvent can do so from this event instead.
Cancelling CreatureSpawnEvent rapidly causes a lot of garbage collection and CPU waste
as it's done after the Entity object has been fully created.
Mob Limiting plugins and blanket "ban this type of monster" plugins should use this event
instead and save a lot of server resources.
See: https://github.com/PaperMC/Paper/issues/917
This allows plugins that give players the ability to apply the experience
points to the Item Mending formula, which will repair an item instead
of giving the player experience points.
Both an API To standalone mend, and apply mending logic to .giveExp has been added.
Fired when the server is about to merge 2 experience orbs
Plugins can cancel this if they want to ensure experience orbs do not lose important
metadata such as spawn reason, or conditionally move data from source to target.
