Make it possible to use the new effect indicators in 1.9

src/main/java/us/myles/ViaVersion/ViaVersionPlugin.java

@@ -239,6 +239,10 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaVersionAPI {
         return getConfig().getBoolean("prevent-collision", true);
     }
 
+    public boolean isNewEffectIndicator(){
+        return getConfig().getBoolean("use-new-effect-indicator",true);
+    }
+
     public boolean isSuppressMetadataErrors() {
         return getConfig().getBoolean("suppress-metadata-errors", false);
     }

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -679,7 +679,7 @@ public class OutgoingTransformer {
             PacketUtil.writeVarInt(duration, output);
             // we need to write as a byte instead of boolean
             boolean hideParticles = input.readBoolean();
-            output.writeByte(hideParticles ? 1 : 0);
+            output.writeByte(hideParticles ? plugin.isNewEffectIndicator() ? 2 : 1 : 0);
             return;
         }
         if (packet == PacketType.PLAY_TEAM) {

src/main/resources/config.yml

@@ -19,4 +19,6 @@ simulate-pt: true
 # Should we patch boss bars so they work? (Default: true, disable if you're having issues)
 bossbar-patch: true
 # If your boss bar flickers on 1.9, set this to 'true'. It will keep all boss bars on 100% (not recommended)
-bossbar-anti-flicker: false
+bossbar-anti-flicker: false
+# This will show the new effect indicator in the top-right corner for 1.9 players.
+use-new-effect-indicator: true