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It is needed to test window system before merging into trunk. The relevant document used for testing come from issue #36146.
I have tested builds with new Window System, it looks fine. I don't know about anything what can prohibit using new window system in the NetBeans after merge. I have found a lot of issues : in UI specs, in implementation, the most of them are already fixed. I am still working on new test specification, it isn't final because specification is changed, it will be finished a few days after merge I hope in a week. I agree with merging new window system to the trunk. Good job, guys.