I have gone through this post and tried all the solutions but none of them worked.
Screenshot:
It started after I installed Flutter Pub Version Checker plugin, and I remember Android Studio popped up a dialog asking something like, (I don't remember all the details)
Do you want to allow multiple entries on holding a button X, you can always run xyz command to get back...
I agreed to that block and then I started having this issue. Can someone please help me?