First GLWindow in first NewtCanvasAWT doesn't get .repaint(), when there are other windows

>
> ---
>
> I have two [JOGL](https://jogamp.org/jogl/) native `GLWindow`s wrapped in
> `NewtCanvasAWT`.
>
> These canvases are added to `JInternalFrame`s each. `JInternalFrame`s are
> added to `JDesktopPane` which is added to a `JFrame`.
>
> I don't have an `Animator` running because `.display()` is called manually,
> when scene changes.
>
> ---
>
> This setup works as expected apart from one thing:
>
> * when the second `JInternalFrame` (order of creation) moves over the first,
> the first is not repainted, what is quite unexpected,
>
> * when the first moves over the second, the second *is* repainted, as expected.
>
> * If I add more frames, only the last one behaves as expected.
>
> The `JInternalFrames` are identical (the same class).
>
> The first `GLWindow` doesn't receive `WindowUpdateEvent` in
> `WindowListener.windowRepaint()`. The second one does.
>
> Here's the stack trace of my `GLEventListener.display(GLAutoDrawable
> drawable)` from the *working* `JInternalFrame`:
>
>
>     java.lang.IllegalArgumentException: test
>     at edu.agh.tunev.ui.opengl.Scene.display(Scene.java:42)
>     at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:373)
>     at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:358)
>     at jogamp.opengl.GLAutoDrawableBase$2.run(GLAutoDrawableBase.java:280)
>     at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:655)
>     at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:594)
>     at com.jogamp.newt.opengl.GLWindow.display(GLWindow.java:543)
>     at
> jogamp.opengl.GLAutoDrawableBase.defaultWindowRepaintOp(GLAutoDrawableBase.java:99)
>
>     at com.jogamp.newt.opengl.GLWindow.access$000(GLWindow.java:94)
>     at com.jogamp.newt.opengl.GLWindow$1.windowRepaint(GLWindow.java:107)
>     at jogamp.newt.WindowImpl.consumeWindowEvent(WindowImpl.java:2392)
>     at jogamp.newt.WindowImpl.consumeEvent(WindowImpl.java:1943)
>     at jogamp.newt.DisplayImpl.dispatchMessage(DisplayImpl.java:388)
>     at jogamp.newt.DisplayImpl.dispatchMessages(DisplayImpl.java:436)
>     at jogamp.newt.DisplayImpl$DispatchMessagesRunnable.run(DisplayImpl.java:371)
>     at
> jogamp.newt.DefaultEDTUtil$EventDispatchThread.run(DefaultEDTUtil.java:293)
>
> This should also happen with the *first* frame. Why doesn't it?
>
> ---
>
> All this does not happen when using `GLJPanel` or `GLCanvas`. However, I do
> not want to use AWT thread for rendering and these `GLAutoDrawable`s use it.
> `NEWT` native windowing toolkit uses another thread.
>
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