Highlight window when rang or new direct message

[skynet-gh]

Not sure there's a Java API for this, so will have to be platform specific. Some relevant links for Windows

https://stackoverflow.com/questions/2773364/make-jface-window-blink-in-taskbar-or-get-users-attention https://stackoverflow.com/questions/7723667/when-is-windows-flashing-a-window https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-flashwindow?redirectedfrom=MSDN http://www.jasinskionline.com/WindowsApi/ref/f/flashwindow.html https://docs.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-flashwinfo https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-flashwindowex

https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-flashwindow

https://stackoverflow.com/questions/489255/how-can-i-flash-the-windows-taskbar-using-swing

[skynet-gh]

Added in https://github.com/skynet-gh/skylobby/releases/tag/0.9.1