I have to (scriptly) take screenshots of windows, some of which may be partially or fully hidden by other windows.  Of course, in such a case the screenshot is useless, and I'd rather print a warning.Unfortunately I'm not in a situation where I can use a Window Manager which prints even hidden or minimized windows  I'm stuck with an old KDE.I can use e.g. xwininfo -id <windowid> | grep Map State to determine if the window IsViewable (which basically means standard screenshot tools won't complain), but I can't seem to figure out how to determine if the window is overlapped by other windows and how much it is (then I could print the warning if, say, less than 50% of the window are visible).(As I'm actually trying to workaround it because I don't believe it exists, of course I won't complain if anyone points me to an easy method to e.g. virtually redraw windows so that the screenshot is worth it)
Computing the visible area of a partly hidden window
command line;x11;screenshot