LOS ANGELES—Apple today announced and gave a first glimpse of its first major MacBook Pro redesign in more than five years. As rumored, it includes an OLED display and, for the first time on macOS, a touchscreen—a change Apple has long debated. (Former CEO Steve Jobs famously was opposed.) Apple’s demonstration video showed users interacting with applications by reaching up to touch the screen, including file dragging and multi-touch gestures like pinch-to-zoom…