Fix Bossbar updating (closes #6061) (#6076)

patches/server/0010-Adventure.patch

@@ -1562,17 +1562,10 @@ index 524428ee32d18c76c0e9c46bbac3664888b1b35c..186c745401a3320432f4aadfadfc6ef4
          // CraftBukkit end
  
 diff --git a/src/main/java/net/minecraft/world/BossEvent.java b/src/main/java/net/minecraft/world/BossEvent.java
-index d289e8321a62f7c8d1e5b83f038e7331a26fc24e..658aff27155b32a0323f55152c7315fdc7b4a82d 100644
+index d289e8321a62f7c8d1e5b83f038e7331a26fc24e..58716ba8f8d12a410bdc66ccef6a61c62fddfbb7 100644
 --- a/src/main/java/net/minecraft/world/BossEvent.java
 +++ b/src/main/java/net/minecraft/world/BossEvent.java
-@@ -1,5 +1,6 @@
- package net.minecraft.world;
- 
-+import io.papermc.paper.adventure.PaperAdventure;
- import java.util.UUID;
- import net.minecraft.ChatFormatting;
- import net.minecraft.network.chat.Component;
-@@ -13,6 +14,7 @@ public abstract class BossEvent {
+@@ -13,6 +13,7 @@ public abstract class BossEvent {
      protected boolean darkenScreen;
      protected boolean playBossMusic;
      protected boolean createWorldFog;
@@ -1580,6 +1573,82 @@ index d289e8321a62f7c8d1e5b83f038e7331a26fc24e..658aff27155b32a0323f55152c7315fd
  
      public BossEvent(UUID uuid, Component name, BossEvent.BossBarColor color, BossEvent.BossBarOverlay style) {
          this.id = uuid;
+@@ -27,61 +28,75 @@ public abstract class BossEvent {
+     }
+ 
+     public Component getName() {
++        if (this.adventure != null) return io.papermc.paper.adventure.PaperAdventure.asVanilla(this.adventure.name()); // Paper
+         return this.name;
+     }
+ 
+     public void setName(Component name) {
++        if (this.adventure != null) this.adventure.name(io.papermc.paper.adventure.PaperAdventure.asAdventure(name)); // Paper
+         this.name = name;
+     }
+ 
+     public float getProgress() {
++        if (this.adventure != null) return this.adventure.progress(); // Paper
+         return this.progress;
+     }
+ 
+     public void setProgress(float percentage) {
++        if (this.adventure != null) this.adventure.progress(percentage); // Paper
+         this.progress = percentage;
+     }
+ 
+     public BossEvent.BossBarColor getColor() {
++        if (this.adventure != null) return io.papermc.paper.adventure.PaperAdventure.asVanilla(this.adventure.color()); // Paper
+         return this.color;
+     }
+ 
+     public void setColor(BossEvent.BossBarColor color) {
++        if (this.adventure != null) this.adventure.color(io.papermc.paper.adventure.PaperAdventure.asAdventure(color)); // Paper
+         this.color = color;
+     }
+ 
+     public BossEvent.BossBarOverlay getOverlay() {
++        if (this.adventure != null) return io.papermc.paper.adventure.PaperAdventure.asVanilla(this.adventure.overlay()); // Paper
+         return this.overlay;
+     }
+ 
+     public void setOverlay(BossEvent.BossBarOverlay style) {
++        if (this.adventure != null) this.adventure.overlay(io.papermc.paper.adventure.PaperAdventure.asAdventure(style)); // Paper
+         this.overlay = style;
+     }
+ 
+     public boolean shouldDarkenScreen() {
++        if (this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.DARKEN_SCREEN); // Paper
+         return this.darkenScreen;
+     }
+ 
+     public BossEvent setDarkenScreen(boolean darkenSky) {
++        if (this.adventure != null) io.papermc.paper.adventure.PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.DARKEN_SCREEN, darkenSky); // Paper
+         this.darkenScreen = darkenSky;
+         return this;
+     }
+ 
+     public boolean shouldPlayBossMusic() {
++        if (this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.PLAY_BOSS_MUSIC); // Paper
+         return this.playBossMusic;
+     }
+ 
+     public BossEvent setPlayBossMusic(boolean dragonMusic) {
++        if (this.adventure != null) io.papermc.paper.adventure.PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.PLAY_BOSS_MUSIC, dragonMusic); // Paper
+         this.playBossMusic = dragonMusic;
+         return this;
+     }
+ 
+     public BossEvent setCreateWorldFog(boolean thickenFog) {
++        if (this.adventure != null) io.papermc.paper.adventure.PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.CREATE_WORLD_FOG, thickenFog); // Paper
+         this.createWorldFog = thickenFog;
+         return this;
+     }
+ 
+     public boolean shouldCreateWorldFog() {
++        if (this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.CREATE_WORLD_FOG); // Paper
+         return this.createWorldFog;
+     }
+ 
 diff --git a/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java b/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java
 index 7a0e7961df1e62b311ea2ecc76d7343a8646723b..6859fafa42527d45366018f737c19e6c3777d152 100644
 --- a/src/main/java/net/minecraft/world/level/saveddata/maps/MapItemSavedData.java