Dark themes have been around since at least the windows 3.0 days. I worked for a company making a "mobile" client in that time-frame that ran on laptops of the

Dark themes have been around since at least the windows 3.0 days. I worked for a company making a "mobile" client in that time-frame that ran on laptops of the era. We had a button in our application that fliped the global windows theme between a high contract day look, and a dark night theme. IIRC both were default windows themes at the time. And frankly back then I don't remember any applications not actually following the windows theming. It was only later in the late 1990's that I started to notice a lot of applications failing to follow the UI theme settings. Initially that was one of the big problems with java applications, they didn't look like windows apps, and they didn't follow the color settings.