I had my small scissors confiscated this fall in Madrid. My bag was scanned, he asked me to remove my little scissors. I took them out and he measured the scissors on a ruler and decided they were too long. These were the type you would use to trim your mustache/beard. Not very big at all. It was in their little priority security line in Terminal 1 and I was the only person there, so maybe it was training or I was just the sole focus of attention. Either way, it wasn't a big deal, and they were very nice about it.

I had gotten in the habit of putting them in checked bags, but had travelled often with them in carry on. So, its probably the law of averages. I'd put them in your checked bags.

Edit to add: they were a little longer than the grooming scissors on your pic, but not by much.