TilemapLayer weightedRandomize does not use the default RNG

[StevenDepa]

Version

• Phaser Version: 3.50.1
• Operating system: Windows 8.1
• Browser: Chrome

Description

The built-in weightedRandomize method of the TilemapLayer does not produce consistent layer distribution between refreshes.
This makes impossible to use this method and produce a consistent output from a given seed.

I've put the seed param in the game config and I've also inspected the phaser source code at https://github.com/photonstorm/phaser/blob/v3.50.1/src/tilemaps/components/WeightedRandomize.js and I've confirmed that the standard Math.random is used instead of the Phaser.Math.RNG functions. I'm not sure how to import it or I've had opened a pull request myself.

Example Test Code

const map = this.make.tilemap({
    tileWidth: 64,
    tileHeight: 64,
    width: 30,
    height: 30
 });
 const tileset = map.addTilesetImage("terrain-tiles", null, 64, 64, 0, 0);
 const layer = map.createBlankLayer("Terrain", tileset);
 layer.weightedRandomize(0, 0, 30, 30, [
    { index: 0, weight: 55 }, 
    { index: 20, weight: 45 } 
 ]);