SPIGOT-1632: Fix a bug in EnderDragonBattle which prevented respawning the dragon in some cases

nms-patches/EnderDragonBattle.patch

@@ -0,0 +1,20 @@
+--- a/net/minecraft/server/EnderDragonBattle.java
++++ b/net/minecraft/server/EnderDragonBattle.java
+@@ -247,7 +247,7 @@
+                         ShapeDetector.ShapeDetectorCollection shapedetector_shapedetectorcollection = this.f.a(this.d, tileentity.getPosition());
+ 
+                         if (shapedetector_shapedetectorcollection != null) {
+-                            BlockPosition blockposition = shapedetector_shapedetectorcollection.a(3, 3, 4).getPosition();
++                            BlockPosition blockposition = shapedetector_shapedetectorcollection.a(3, 3, 3).getPosition(); // CraftBukkit - 4 -> 3
+ 
+                             if (this.o == null && blockposition.getX() == 0 && blockposition.getZ() == 0) {
+                                 this.o = blockposition;
+@@ -267,7 +267,7 @@
+ 
+             if (shapedetector_shapedetectorcollection1 != null) {
+                 if (this.o == null) {
+-                    this.o = shapedetector_shapedetectorcollection1.a(3, 3, 4).getPosition();
++                    this.o = shapedetector_shapedetectorcollection1.a(3, 3, 3).getPosition(); // CraftBukkit - 4 -> 3
+                 }
+ 
+                 return shapedetector_shapedetectorcollection1;