Respect already selected collection when adding new documents or images

Is your proposal related to a problem?

Documents and Images list views allows filtering by Collection. Choosing a collection and clicking on “Add a document” opens a new view, where first (Root) collection is selected. This causes confusion to some users and makes them make mistakes where the document would be uploaded.

Describe the solution you’d like

It would be great if a button to add new documents would transfer currently selected collection id as parameter to multiple add view. This way current user would upload files to already choosen collection, which looks like right thing to do, especially if there are more then few collections.

Describe alternatives you’ve considered

Did not found any other alternative for this.

Additional context

This should be pretty easy to implement, in few steps:

1. AddView would accept optional query parameter collection_id and pass it to template, which would select current collection.
2. document index template already has current_collection, so the only change required here would be to pass it to wagtaildocs:add_multiple url
3. change in second step would be made in image index template

If there are no objections for this, I can prepare pull request.

[bmihelac]

I’m working on it

[lb-]

Update

• https://github.com/wagtail/wagtail/pull/7810 made a lot improvements to how the collection ID can be passed around to the various add/edit pages
• It does not fix this issue though
• PR https://github.com/wagtail/wagtail/pull/7756 is looking close but now needs to be rebased on main and refactored to account for the new approach that #7810 brought in

@bmihelac - Are you still keen on pursuing this fix you started but with the new approach? https://github.com/wagtail/wagtail/pull/7756