Eclipse autostart no longer works

I am using Eclipse Neon (on Mac OS) and working mainly with libgdx right now. When I need to import some classes, I usually follow the normal CMD+ Shift+ procedure O.

The non-libgdx class is imported fine, the libgdx class is imported only when I do it manually, so the build path is correct. Why does the "arrange imports" command (used by the key procedure above) ignore libgdx?

I've tried the following steps:

• cleanup projects + restarting Eclipse
• to restart a computer.
• Gradle update
• re-installing the same version of Eclipse
• installing old version (Eclipse Mars)

These steps do not solve the problem, maybe you have an idea?