Added a shortcut key, default is Ctrl+F2, can be modified in settings.
It changes the current window's hierarchy, toggling between and .
When the current window is not on top, the shortcut key will bring it to the top, and if the window has a taskbar, the title will be marked with <**>;
When the current window is already on top, it will be brought down, and if the window has a taskbar with the <**> mark, it will be removed.
See the effect in the following Gif:
