message: added changeDecorations to Target in System.ts
diff: @@ -10,6 +10,7 @@ import { AntiAliasPref,
  HiddenLine,
  ColorDef,
  Graphic,
  + Decorations,
  GraphicBranch } from "@bentley/imodeljs-common";
  import { Viewport } from "../Viewport";
  import { GraphicBuilder, GraphicBuilderCreateParams } from "./GraphicBuilder";
  @@ -52,9 +53,17 @@ export class Plan {
  }
  }
  +/**
  + * A Render::Target holds the current scene, the current set of dynamic Graphics, and the current decorators.
  + * When frames are composed, all of those Graphics are rendered, as appropriate.
  + * A Render::Target holds a reference to a Render::Device, and a Render::System
  + * Every DgnViewport holds a reference to a Render::Target.
  + */
  export abstract class Target {
  - constructor(public system: System) {}
  + constructor(public system: System,
  + public decorations: Decorations = new Decorations()) {}
  public createGraphic(params: GraphicBuilderCreateParams) { return this.system.createGraphic(params); }
  + public changeDecorations(decorations: Decorations): void { this.decorations = decorations; }
  }
  export class OnScreenTarget extends Target {
  