Modern Windows apps also suffer from this kind of breakage. For example, the calculator. If you use the mouse to press a button while entering a calculation (f

Modern Windows apps also suffer from this kind of breakage. For example, the calculator. If you use the mouse to press a button while entering a calculation (for a trigonometric function say) then when you press enter to get the result it just presses that button again. This is contrary to the Windows design guidelines and, more importantly, it isn't useful. It's like the apps have been redeveloped by people who never use a keyboard.