cmd-Y deletes a line, but more besides

On rubymine cmd-Y (mac) deletes the current line.  

But if that line happens to be highlighted, it deletes that line and the subsequent line.  This is a major gotcha and has bitten me on a number of occasions.  (cmd-Y will also delete the entire currently highlighted block, whatever that happens to be).

Is there a way to delete the current line that will function irrespective of whatever highlight may be currently activated?