I'm on Debian 10 testing, fully updated, so on KDE Plasma 5.13.5
I'm using IntelliJ IDEA 2018.3 EAP on Oracle JDK 1.8.181
When I open IDEA (maximized by default), this appears:
You can see I only have the maximize and close buttons.
If I resize it, the minimize button appears:
What can I do to solve this issue? It happens also on the starting projects dialog, in which case the close button goes "out" of the dialog on the upper right corner.