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Beside the open API (the one exposed in org.openide.windows.* package) will exist also inner API, which will offer extended control over window system for clietn. But at the moment won't be exposed as an open one. That API will be used by internal winsys action implementations and DnD frameworks impelementation. It would be nice, that that API will be declared by some interfaces extending to ones from open API.
Fixed in branch winsys_29836
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