Comment 2 for bug 1218481

This is a question of whether consider right-edge to swipe to be back swipe or alt-tab (switching between two latest focused app). We have considered alt-tab alternative as well but currently favouring back behaviour.

It really depends on the task you're performing which behaviour makes more sense. Obviously if you want to switch between two different tasks, for example browser and calculator, alt-tab behaviour would be optimal. Then on the other hand if you try to go back to an app you were few views ago you want right-edge to work as back. Otherwise you would just swap between two latest focused app.

We're also considering adding Dash to be part of the app stack and available through right edge. Most probably it will be there in the future.