[REG 4.4 -> 4.5] Renaming file does not update project tree when .pro file was edited before

1. Create a new Qt Widget Application project.
2. Edit the project's .pro file, e.g. by adding a comment.
3. Save and close the .pro file.
4. After the Projects view was updated, right-click on a file and select "Rename..." from the context menu.
5. Type a new name for the file.
6. Press Enter.
7. The .pro file will be updated but the Projects view will not be refreshed.

The Projects view should be updated to reflect the renaming.

This worked correctly in Creator 4.4.

Found by Squish test tst_rename_file.