Method XbpSysWindow():isVisible() Foundation
Returns whether the system window is visible.
:isVisible() --> lVisibleThis method returns the value .T. (true) if the system window is currently visible on the screen, otherwise it returns .F. (false).
A system window can be temporarily removed from the screen using the method :hide(). This hides the system window and it is no longer visible. The method :isVisible() is used to determine whether the system window is visible. The :show() method is used to make the system window visible again.
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