I have a OS X 10.12.6 recent MacBook Pro. On a previous version of the OS, if I had an image file on the desktop, it was easy to grab the icon with the mouse and drag it onto another application. Now (I think when I upgraded to 10.12.6), such a drag action is very difficult: it only occasionally works, and most of the time as I start to drag there is an additional trackpad-depress sensation and a quick preview pops out of the icon. Here's a screenshot of such a preview:
Question: What is this new preview feature called, and is there a way to disable it?