feature: allow for slide to be added with a specific index

[smcpherson]

Not sure if this exists but I browsed over existing features and didn't see mention of this specifically. You mention it in the documentation:

At the time of writing it’s the only way to add a slide, but sooner or later I expect someone will want to insert one in the middle, and when they post a feature request for that I expect I’ll add an insert_slide(idx, ...) method.

So here is the feature request :)

[wildmichael]

:+1: More than two years in the backlog :-(

[13911432305]

I need this feature

[Job-Heersink]

I'm also in need of this feature.

[MartinPacker]

I think this is quite fiddly. And probably goes with "delete slide" and "move slide".

But then I'm not the developer.