Is it possible to check with the means of pure X11/Xlib only whether the given window is iconified/minimized, and, if it is, how?
yes. there are several ways of doing it:
read the _NET_WM_STATE property and check its content (as described in http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2507241 ). for code, how to do this see some windowmanagers (fluxbox or pekwm comes to mind)
read the WM_STATE property and check its content (as described in http://tronche.com/gui/x/icccm/sec-4.html#s-4.1.3.1).
XGetWMHints() seems to be the preferred way of doing it.
There s also the function XGetZoomHints(), but that seems to have been deprecated.
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Is it possible to check with the means of pure X11/Xlib only whether the given window is iconified/minimized, and, if it is, how?
