RFR: 8273355: Lanai: Flickering on tooltip appearance IntelliJ IDEA 2021.2.1 [v2]

[Sergey Bylokhov]

On Fri, 10 Sep 2021 19:30:20 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

>> Used setOpaque() method to set correct background of platform window
>
> Alexey Ushakov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8273355: Lanai: Flickering on tooltip appearance IntelliJ IDEA 2021.2.1
>   
>   Extracted setting background to the particular method in PlatformWindow. Provided appropriate implementation in CPlatformWindow.

Then why you clearly see that missmatch in case of metal? probably we initialise the metal layer or its texture to some wrong color? or it is transparent and background of the nswindow is visible?

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PR: https://git.openjdk.java.net/jdk/pull/5373