Don't apply previous potion when item is potion (fixes #7756) (#7757)

patches/server/0873-More-Projectile-API.patch

@@ -132,7 +132,7 @@ index 6bfa984781a483d048ef4318761203c701d8a632..5e0c2c5094e1578162d1a50d50701fbd
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
-index b08739dd1ffd041f0885af6c1f57dca9027763b6..2edaae449f936b210a48c52ab8d921544c8a0005 100644
+index b08739dd1ffd041f0885af6c1f57dca9027763b6..c1594f62c06a49ba2d0c2c6e6befcda7d1fe6e1b 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
 @@ -39,11 +39,26 @@ public class CraftThrownPotion extends CraftProjectile implements ThrownPotion {
@@ -141,10 +141,10 @@ index b08739dd1ffd041f0885af6c1f57dca9027763b6..2edaae449f936b210a48c52ab8d92154
          // The ItemStack must be a potion.
 -        Validate.isTrue(item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION, "ItemStack must be a lingering or splash potion. This item stack was " + item.getType() + ".");
 +        //Validate.isTrue(item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION, "ItemStack must be a lingering or splash potion. This item stack was " + item.getType() + "."); // Paper - Projectile API
-+        var meta = getPotionMeta(); // Paper - Projectile API
++        org.bukkit.inventory.meta.PotionMeta meta = (item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION) ? null : this.getPotionMeta(); // Paper - Projectile API
  
          this.getHandle().setItem(CraftItemStack.asNMSCopy(item));
-+        setPotionMeta(meta); // Paper - Projectile API
++        if (meta != null) this.setPotionMeta(meta); // Paper - Projectile API
      }
  
 +    // Paper start - Projectile API