Existing builds automatically detected, but not from default build directories

1. Open a project.
2. Build this in the default directory.
   The name of that directory starts with "build-".
3. Create and select a new build configuration.
4. Remove the "build-" from the build directory.
5. Build the project.
6. Close the project.
7. Remove the .pro.user file from the project's source directory.
8. Open the project again.
9. Go to Projects mode.
   The build from step 5 was found by Creator and is checked. The build from step 2 was not found:
   
   In this simple example, you can still add that build by checking the default build directory, but this only works because the kit is already known. If you remove the kit and the build from step 5 before opening the project again, Creator will not propose that kit.

If builds from any directory are being found automatically, it should be the default build directory.