I have a JInternalFrame inside a JPanel, all is working great, but when I reposition the internal frame and then move the cursor outside the JPanel, it resets its position.
I couldn’t see anything in the API related to this.
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An internal frame was not designed to be used with a JPanel.
It was designed to be used with a JDesktopPane which uses a null layout. A JPanel uses a FlowLayout by default.
So I would guess somehow the layout manager is invoked and the location of the internal frame is being reset.
Just use a desktop pane and you won’t have these problems.