message: CM: Target already gets IDisposable from RenderTarget.
diff: /** @module WebGL */
  import { Transform, Vector3d, Point3d, ClipPlane, ClipVector, Matrix4d } from "@bentley/geometry-core";
  -import { BeTimePoint, assert, Id64, BeDuration, StopWatch, IDisposable } from "@bentley/bentleyjs-core";
  +import { BeTimePoint, assert, Id64, BeDuration, StopWatch } from "@bentley/bentleyjs-core";
  import { RenderTarget, RenderSystem, DecorationList, Decorations, GraphicList, RenderPlan } from "../System";
  import { ViewFlags, Frustum, Hilite, ColorDef, Npc, RenderMode, HiddenLine, ImageLight, LinePixels, ColorByName } from "@bentley/imodeljs-common";
  import { FeatureSymbology } from "../FeatureSymbology";
  @@ -140,7 +140,7 @@ export class Clips {
  public get isValid(): boolean { return this.length > 0; }
  }
  -export abstract class Target extends RenderTarget implements IDisposable {
  +export abstract class Target extends RenderTarget {
  private _stack = new BranchStack();
  private _scene: GraphicList = [];
  private _decorations = new Decorations();
  