Kindly request your attention for a really annoying visual Java bug on Linux Mint

[Stefan Reich]

Hello Alexey,

thanks a lot for investigating and submitting the bug. I don't think I can
sign up at bugs.openjdk.java.net directly, right?

I have also done some further testing, for example on an older version of
Peppermint Linux (also on my ThinkPad). Same kind of errors appear. So it
doesn't seem related to the flavor of Linux used.

I have also tried the source code you produced. It gives the same artifacts
as my original version.

> Perhaps, the calculation of the grid has an error or something like that.

I challenge you to show me the bug in that 10 line function... ^^ (Don't
think the problem is in there)

Originally I had simply tried to make a JWindow covering the whole second
screen and it was completely opaque. That's how I discovered the bug in the
first place.

So... judging from the official bug report it seems this is being
investigated by the proper "authorities", right? That's a very good result
for now.

Many greetings,
Stefan



On Fri, 21 Jan 2022 at 22:38, Aleksei Ivanov <alexey.ivanov at oracle.com>
wrote:

> Dear Stefan,
>
> Thank you for reporting the bug.
>
> You could have submitted the bug via https://bugreport.java.com/bugreport/
>
>
> Anyway, I reproduced the issue and now I've submitted the bug for you:
> https://bugs.openjdk.java.net/browse/JDK-8280482
> "Window transparency bug on Linux Mint"
>
> I attached a modified version of your testcase which creates all the
> windows on the EDT.
>
>
> Even though I see the problem, there could be something wrong with the
> test, or possibly window placement. If I add a delay after a window is
> created, I can see that all the screen is getting covered gradually with
> windows and all the windows have the same level of translucency. When
> the bottom of the screen is reached, the new windows get moved above so
> that the newly created window does not cover the taskbar. This creates a
> darker rectangle seen along the bottom of the screen on the main monitor.
>
> In my environment, the dark square area that you have on your screenshot
> is not as large, it covers only the part of the screen on the main
> monitor. At the same time, this area appears only when all the windows
> are created. Again, it could be that some of the windows of the grid get
> misplaced for whatever reason. Perhaps, the calculation of the grid has
> an error or something like that.
>
> Eventually, it may be a bug not in Java but in the sample app. I'll play
> around with it over the weekend if I have time.
>
> On 21/01/2022 20:10, Stefan Reich wrote:
> > Dear Sirs or Madams,
> >
> > I make a visual recognition tool <https://gaz.ai> in Java that would
> > tremendously benefit from the ability to show translucent windows.
> Indeed,
> > Java has such an ability but it is broken on my Linux Mint 19 ThinkPad
> for
> > unknown reasons (screenshot <https://botcompany.de/images/1103064>).
> >
> > All the details are here:
> >
> > https://github.com/adoptium/adoptium-support/issues/430
> >
> > I'd love to see this fixed. Not sure how reproducible it is or if there
> is
> > anything screwed in my Linux Mint installation. Seems to run fine
> otherwise
> > though.
> >
> > Many greetings,
> > Stefan Reich
> --
> Regards,
> Alexey
>


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