Cannot build AsyncView in Cursive::call_on_name()

Hi,

I have the usecase where I need to build a `AsyncView` from `Cursive::call_on_name()`.

I'm not sure how to do that.

The usecase is: I have a sidebar with a list of items and as soon one is selected, I want to add a tab (via cursive-tabs) in the main view, loading something. The loading process can take time (minutes!), so I figured to use cursive-async-view. But because I want to create the view in `Cursive::call_on_name()`, I cannot use `&mut siv` to pass to the constructor of `AsyncView`.

Do you have an idea how to work around this?

No files or tests are identified. Start by reading AsyncView's constructor alongside Cursive::call_on_name() and the cursive-tabs integration described in the issue. Done would require a documented or implemented way to create the loading view in that callback while handling the long-running load.

Written by the indexing model from the issue text.