How to prevent IntelliJ IDEA from deleting unused packages?

Question

I\'m working with intelliJ and my problem is when I start to import some temporary unused packages into my class file intellij delete those line within a second.

how

Answer 1

For Scala developers: you can have enabled

Settings > Editor > General > Auto Import > Optimize imports on the fly

but add exclusions into

Settings > Editor > Code Style > Scala > Imports always marked as used: