[Zotero] Ability to add a reference in an existing citation

[parrenin]

With the new Zotero plugin, it is now possible to edit a citation, which is good.
While editing a citation, it is possible to remove one of the references inside the citation, but it is not possible to add a new one.
I am not sure would the best UI to do that.
Maybe, while the "edit citation" window is opened, selecting a reference in the left pane and clicking "insert citation/reference" would add this reference into the existing citation (instead of creating a new citation).

[VladimirProkofiev52]

Hello! @parrenin I have issued this enhancement as bug 81123.
Thank you for your report.

[bcrawford-cpm]

This feature is included in my PR #546 . It adds checkmarks to add and remove citations from existing citations, and also to reorder them.