Steam VR appears to close the editor when another project is opened if the editor was focus by steam VR

Steam VR appears to close the editor when another project is opened if the editor was focus by steam VR. This does not allow the user to save and does not give a warning.

1. Make sure that the vive is hooked up and turned on
2. Open Steam VR
3. Open a project
4. Make sure that the editor is focused by steam VR (Run VR preview)
5. Stop VR preview
6. Open a second project (By using the u.project file found in unreal projects folder)
7. Notice that the first project is closed without saving or warning

Expected: The user would be able to open multiple projects
Result: The user can only open one project at a time when using Steam VR