Add output to ModalGalleryComponent emitting whenever the image is changed

[srtab]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[x] Feature request
[ ] Documentation issue or request
[ ] Support request

Current behavior

There's no way to know whenever the current image is changed. If the image is changed by clicking on the preview, i have no way to catch it. I only can catch when it's changed using keyboard or click on the arrows.

Expected behavior

Whenever the current image is changed, emit an output, either by keyboard, click on arrows or click on preview.

What is the motivation / use case for changing the behavior?

The use case is adding extra behavior whenever the image that the user is viewing, change. For instance: add custom event to analytics for tracking.

[Ks89]

You are right.
I should trigger show/isLast/isFirst events also with previews.

I schedule this for 7.1.0, because I released 7.0.0 beta1 yesterday and I'm really busy to fix some issues before the final version of 7.0.0 and I don't want to add other stuff into that release.

[srtab]

Sorry, i accidentally closed the issue.

[Ks89]

No problem. I'll work on this in a couple of weeks, as soon after the release of 7.0.0 final

[Ks89]

I'm sorry for the delay. 7.0.0 was really challenging. I released the last RC some days ago, so in a couple of weeks I'll release the final version.
7.1.0 will be released in December.

[srtab]

No problem @Ks89 :)

[Ks89]

Implemented in 7.1.0. I want to release it tomorrow or Monday.

Issue closed, feel free to reopen if you'll have problems.