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After making changes in the GridBagLayout editor, components are sometimes no longer highlighted when clicking on them. This is happening quite often for me.
I can reproduce this by making a new JPanel, set it to GridBagLayout, add 3 JButtons, run the Customizer, click on the "hide empty rows and column" button and when I click a button, they won't highlight any longer.
*** This bug has been marked as a duplicate of bug 213509 ***