message: canvas3d: add commited event
diff: @@ -47,7 +47,7 @@ export const Canvas3DParams = {
  on: PD.Group(StereoCameraParams),
  off: PD.Group({})
  }, { cycle: true, hideIf: p => p?.mode !== 'perspective' }),
  - manualReset: PD.Boolean(false, { isHidden: true })
  + manualReset: PD.Boolean(false, { isHidden: true }),
  }, { pivot: 'mode' }),
  cameraFog: PD.MappedStatic('on', {
  on: PD.Group({
  @@ -117,6 +117,7 @@ interface Canvas3D {
  notifyDidDraw: boolean,
  readonly didDraw: BehaviorSubject<now.Timestamp>
  + readonly commited: BehaviorSubject<now.Timestamp>
  readonly reprCount: BehaviorSubject<number>
  readonly resized: BehaviorSubject<any>
  @@ -218,6 +219,7 @@ namespace Canvas3D {
  let startTime = now();
  const didDraw = new BehaviorSubject<now.Timestamp>(0 as now.Timestamp);
  + const commited = new BehaviorSubject<now.Timestamp>(0 as now.Timestamp);
  const { gl, contextRestored } = webgl;
  @@ -391,6 +393,7 @@ namespace Canvas3D {
  draw(true);
  forceDrawAfterAllCommited = false;
  }
  + commited.next(now());
  }
  }
  @@ -616,6 +619,7 @@ namespace Canvas3D {
  get notifyDidDraw() { return notifyDidDraw; },
  set notifyDidDraw(v: boolean) { notifyDidDraw = v; },
  didDraw,
  + commited,
  reprCount,
  resized,
  setProps: (properties, doNotRequestDraw = false) => {
  