Even back when we had much fewer pixels on most displays, people knew 1px drag targets were a bad idea. Some UIs dos have single pixel borders, but tended to ha

Even back when we had much fewer pixels on most displays, people knew 1px drag targets were a bad idea. Some UIs dos have single pixel borders, but tended to have extra decorations at the corners so there was something larger to interact with there, and/or implemented something like a control key making any point in the window a size/move target.