[OpenJDK 2D-Dev] RFR: 8266079: Lanai: AlphaComposite shows differences on Metal compared to OpenGL [v2]

[Sergey Bylokhov]

On Wed, 4 Aug 2021 23:06:54 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> 1. Run SwingSet2
>> 2. Click on all tabs starting from the second one 
>> 3. On the tab with swing tree control try to expand some tree nodes -> you'll see black rectangles while performing  the clicks
>> 
>> It may not be reproduced on a first attempt. On my machine it's reproducible with probability at least 50%
>
> Thank you, looking into it.

I check the steps below and was able to reproduce the same artifacts(black rectangles) in the tree tab with the current version of the fix. And I do not see a big difference between setting the layer to YES at the beginning or a little bit later, at the end, it will be opaque and artifacts occur.

1. Run SwingSet2
2. Click on all tabs starting from the second one, delay on each tab for the second or so
3. On the tab with swing tree control try to expand some tree nodes -> you'll see black rectangles while performing the clicks
4. Repeat from step 2 if no artifacts are visible

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PR: https://git.openjdk.java.net/jdk/pull/4946