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Open some document in editor, it has focus (see blinking cursor), maximize it, the focus is moved to main window (toolbar or menu).
During that switch to maximized (and back) state are removed and added components into hierarchy.. thus the focus is moved to the toolbar/menu etc.
Fixed in [trunk] core/windows/../view/ui/MainWindow.java 1.3
*** Issue 37302 has been marked as a duplicate of this issue. ***
verified in [nb_dev](200311181900)