P2.World.updateBoundsCollisionGroup didn't set the _boundsOwnGroup private var, meaning the World.setBounds method wasn't able to restore previously set collision masks automatically (thanks @jmp909 phaserjs#2183)

Author: photonstorm

README.md

@@ -374,6 +374,7 @@ You can read all about the philosophy behind Lazer [here](http://phaser.io/news/
 * Graphics objects can now have a Physics Body directly attached to them, where-as before it would throw an error due to a lack of anchor property (thanks @NLilley #2400)
 * A Game Object with `fixedToCamera = true` that was then set for Input, and enabled for dragging from its center (`input.enableDrag(true)`) would throw an error upon being dragged (thanks @solusipse #2367)
 * P2.World.updateBoundsCollisionGroup wouldn't use the `boundsCollisionGroup` mask if you passed `true` as the argument, only if it was left undefined.
+* P2.World.updateBoundsCollisionGroup didn't set the `_boundsOwnGroup` private var, meaning the `World.setBounds` method wasn't able to restore previously set collision masks automatically (thanks @jmp909 #2183)
 
 ### Pixi Updates
 

src/physics/p2/World.js

@@ -639,6 +639,8 @@ Phaser.Physics.P2.prototype = {
             this.walls.bottom.shapes[0].collisionGroup = mask;
         }
 
+        this._boundsOwnGroup = setCollisionGroup;
+
     },
 
     /**