Show dialog navigation history

[steersbob]

Dialogs can be stacked, and block widgets commonly have buttons that open a dialog for related blocks. As dialogs overlap each other perfectly, there is no feedback on what dialogs are open behind the current one, or how the user navigated to open the current dialog.

An example implementation would be to show a > separated list of active dialogs by name. The user can navigate between dialogs in the stack by clicking on the name. If a new dialog is opened, any other dialogs in the previous branch should be closed.