[x11] root window support _NET_WM_WINDOW_OPACITY
java gui will check this property on root window. see: https://github.com/openjdk/jdk/blob/6b55ef3b58ae405c46f440e06b5adb03cec3a500/src/java.desktop/unix/classes/sun/awt/X11/XNETProtocol.java#L328 Signed-off-by: Hongfei Shang <shanghongfei@kylinos.cn>
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