- showRelativeToRect:ofView:preferredEdge: must take provide a view, and if the rect is empty it defaults to the view's bounds.
- If If showRelativeToRect is called while a popover is closing, it is ignored.
- If showRelativeToRect is called when the popover is already open, it should just reposition the existing popover.
- close should NOT consult the delegate's popoverShouldClose. Only performClose should do that.
- If a window is closed, all of its popovers immediately order out.
- Updated demo app to cover more cases.
- Note that child popovers are currently not supported, as this requires support for child windows in CPWindow.