Uncollapses the splitter this handle is associated with by restoring \
        its sizes from before the collapse occurred.
        
        :return     <bool> | changed

def uncollapse( self ):
        """
        Uncollapses the splitter this handle is associated with by restoring \
        its sizes from before the collapse occurred.
        
        :return     <bool> | changed
        """
        if ( not self.isCollapsed() ):
            return False
        
        self.parent().setSizes(self._storedSizes)
        self.unmarkCollapsed()
        
        return True