fix repeated adding of slide down
fix repeated adding of slide down

fhinkel/tryM2,fhinkel/tryM2,antonleykin/InteractiveShell,YueRen/tryM2,YueRen/tryM2,fhinkel/tryM2,YueRen/tryM2,fhinkel/InteractiveShell,fhinkel/InteractiveShell,antonleykin/InteractiveShell,antonleykin/InteractiveShell,fhinkel/InteractiveShell,fhinkel/InteractiveShell,fhinkel/tryM2