XLowerWindow is called for every tiled win at every lt->arrange() call which moves the window back in the X window stack
this is not a problem for other tiled layouts or when only one window is visible, but when we have more windows all the hidden windows got an Expose event which causes annoying blinking eg it occures whenever a popup dialog appears or disappears solutions: ban() the invisible windows or don't call restack (it may cause problems with floating windows but i don't use many) btw i like this layout very much, it can be used as togglemax for tiled windows
