Annoying window behavior

In client 2.2.6, if a camera is opened into a separate window from a layout, and the main window is zoomed down, the single-camera window is also zoomed down. This precludes configuring a desktop with a single window showing with a single camera, which is useful. Perhaps this tiny change could be made in a future version.

Summary: decouple the window-minimize behavior so that minimizing the main window does not minimize child windows (windows opened by opening a single camera in a new window).