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There is a need according to threading doc, achieve that window system code processes in AWT thread only. In the final state should all API methods start with: assert SwingUtilities.isEventDispatchThread(); line. First there will be informational exception announcing the change.
TopComponentGroup API assertions added: core/windows/../WindowManagerImpl.java 1.12 /TopComponentGroupImpl.java 1.3
Added informative exceptions to start to force modules to follow the rule: core/windows/../ModeImpl.java 1.13 /WindowManagerImpl.java 1.14
There is one fix now: core/../Main.java 1.184
done, awt thread assertions are inplace.