When installiing as root via sudo, final launch of QtC must downgrade privileges to user or we get stray root-owned files

1. Download the installer for linux
2. You install it in /opt via: sudo ./qt....
3. At the end, "Launch Qt Creator" (will run as root!)
4. You will get root-owned files all around /home/user/.config/
5. Close QtC

Then try to launch it as user, QtC warns files cannot be written (because they are owned by root). It is solvable changing permissions but it's annoying and might pose high security threats.