Get screenshot of SSD windows partially out of screen or under other Always on Top windows
As reported here, SSD windows when out of screen are only partially captured and when covered by an Always on Top window which appears on the screenshot.
This does not affect CSD windows, the difference lies in get_window_screenshot
which takes a pixbuf from the root window when the active window has no extents (e.g. SSD), whereas for CSD windows the pixbuf is taken from the active window. The former approach is needed to capture the server side decorations.
From what I see, the only improvement is to get the pixbuf from the active SSD windows if "Capture window is disabled".