Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Use case

As a next step to Nested stateful navigation with ShellRoute, it would be great to support an option to allow pre-loading of all the main branches.

This is to support data-oriented apps where each bottom navigation tab needs to fetch some data. While currently this can be done by doing the pre-fetching from within the initial bottom navigation tab, I think its best to have each tab resposible for its own logic and currently this is impossible as all tabs except the initial aren't loaded unless the user explicitly clicks the tab.

Proposal

Introduce an option to StatefulShellRoute whether or not to load all main branches.