'rgl.bringtotop' brings the current RGL window to the front of the window stack (and gives it focus).
whether to make the window stay on top.
TRUE, then the window will stay on top
of normal windows.
not completely implemented for X11 graphics (stay not implemented; window managers such as KDE may block this action (set "Focus stealing prevention level" to None in Control Center/Window Behavior/Advanced)). Not currently implemented under OS/X.
Ming Chen/Duncan Murdoch
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