Add drag-and-drop support to StreamField

[zerolab]

Currently StreamField follows old InlinePanel behavior when it comes to reordering items.

With 901b68c...46b77d4 in, it would be great to get drag-and-drop support.

Currently implemented in https://github.com/wagtail/wagtail/blob/master/wagtail/wagtailadmin/templates/wagtailadmin/pages/index.html#L26

[BertrandBordage]

As part of the Wagtail’s first Kickstarter campaign, I’m working on this!
https://www.kickstarter.com/projects/noripyt/wagtails-first-hatch

[nfletton]

A nice to have feature would be to support drag-and-drop between StreamFields that support the same type of block as that being dragged

[tbrlpld]

This would be a fantastic feature to have!

[pablopalacios]

Hi, is there any blocker for this one? I might be able to allocate people in my team to work on it (both in UX and tech) if there are no big blockers here.

[thibaudcolas]

There are no big blockers on this to the extent I’m aware :) It’s large enough of a change to require a fair bit of UX and tech research, design & build prototypes to proceed with implementation. In particular the existing drag and drop implementation in Wagtail isn’t going to be suitable for the StreamField use case, so there needs to be a new design created acknowledging the full UX outside of the "happy path", and fully accessible.