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Switch netbeans.windows=sdi/mdi should be used to set default GUI mode. Element "ui-mode" in file WindowManager.wswmgr cannot be used for such purpose.
As issue #11837 was fixed attribute "maximized" was added to element "main-window" but DTD was not updated. So add it too to new DTD.
Because Window System v1 will not be supported from now by our team, all old winsys issues (now "core/window system v1" issues) are going to be closed as WONTFIX. Changes in API which emerged both from UI spec and problems with adjusting to the older API are described in the document http://core.netbeans.org/windowsystem/changes.html. It shows also recommends how the client code should be adjusted to the new window system. If you think this issue apply also to the new winsys then change the subcomponent (to "core/window system") and REOPEN it.
issue doesn't apply to new window system - verified