Image not getting dismissed when using back button on device

[jtushar53]

Using Ionic 4, tested on Ionic 4.7.4 and 4.6.2. Also is reproducible when using https://fivethree-team.github.io/ionic-4-components/image from a mobile's chrome browser.

Workaround: - Use emitter, didOpen and didClose

<fiv-gallery #fivGallery (didOpen)="onImageOpen()" (didClose)="onImageClose()">

  onImageOpen() {
    this.backBtnSub = this.platform.backButton.subscribeWithPriority(1, () => {
      this.closeImagePopup();
    });
  }

  onImageClose() {
    this.backBtnSub.unsubscribe();
  }

  closeImagePopup() {
    this.giveGallery.close();
  }