Project navigation issues: Navigating while new project generates jumps back to original project, resets scenes

[gaborcselle]

There are two bugs I noticed with project generation:

1. Go to "New Project", type in a concept, e.g. "ProductHunt Demo Day". Let's call this Project A.
2. While it's building the scenes, navigate to a different project Project B.
3. Bug 1: When the gen_project_1_name finishes, the screen returns to the currently generating Project B
4. Bug 2: Go back to a Project B. When the scenes from the new project are done building, the scenes in the currently viewed project (Project B) reset - even thought they're already generated.