Android Studio basic auto completion shortcut not working

I'm running Android Studio on Windows 10. File -> Settings -> Editor -> General -> Code Completion

The default hotkeys for Auto-Complete are:

1) Control + Space + Spacebar

2) Control+ Spacebar

You need to change the Mac OS X keyboard shortcuts (Preferences | Keyboard | Shortcuts | Spotlight) and either disable the "Show Spotlight search" shortcut or reassign it to a different key.

As an alternative to yole's answer: Since I did not want to modify my system's shortcuts to have them the same across my Macs, I just edited the shortcut in Android Studio (Android Studio -> Preferences -> Keymap and change Basic Completion).

I've used Option+Space which is not assigned to any global shortcut.

P.S.: This is indeed a nuisance coming from years of Windows usage.