add comment explaining logic

patches/server/1036-Item-stack-name-tooltip-API.patch

@@ -5,15 +5,16 @@ Subject: [PATCH] Item stack name tooltip API
 
 
 diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
-index 9d1e68c09fa7093cf0f6fa636f90cb15a44cbb38..3b74464b2c0300a252bac22897f61050500b2189 100644
+index 9d1e68c09fa7093cf0f6fa636f90cb15a44cbb38..4384869b79539c9e424b20bd656b67160a475b77 100644
 --- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
 +++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
-@@ -805,6 +805,18 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
+@@ -805,6 +805,19 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
          this.trackEnteredOrExitedLavaOnVehicle();
          this.updatePlayerAttributes();
          this.advancements.flushDirty(this);
 +
 +        // Paper start - Item stack name tooltip API
++        // This is taken from net.minecraft.client.gui.Gui#tick and adapted to a non-tick behaviour.
 +        ItemStack selectedStack = this.getInventory().getSelected();
 +        if(selectedStack.isEmpty()) {
 +            lastItemStackChangeTime = 0;
@@ -27,7 +28,7 @@ index 9d1e68c09fa7093cf0f6fa636f90cb15a44cbb38..3b74464b2c0300a252bac22897f61050
      }
  
      private void updatePlayerAttributes() {
-@@ -2944,4 +2956,12 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
+@@ -2944,4 +2957,12 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
          return (CraftPlayer) super.getBukkitEntity();
      }
      // CraftBukkit end