Gets the System.Drawing.Rectangle representing the overlap area between a System.Windows.Forms.ToolStripDropDown and its ToolStripDropDown.OwnerItem.
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If the System.Windows.Forms.ToolStrip is not a System.Windows.Forms.ToolStripDropDown or the ToolStripDropDown.OwnerItem is null, the ToolStripRenderEventArgs.ConnectedArea property returns an empty System.Drawing.Rectangle.