Prevent back navigation when drawer is open

[breakthestatic]

Is your feature request related to a problem? Please describe.
When the drawer is open, using the OS-level back button triggers a navigation to the prior page. This closes the drawer, but also moves the user off the page they were on.

Describe the solution you'd like
It would be great to have an option to allow back navigation event to just close the drawer instead of also performing a navigation event.

Additional context
Dealing with overriding default browser/webview navigations can be a bit problematic.
Also should be opt-in configuration I think.