RFR: 8006421: GraphicsConfiguration of a frame is changed when the frame is moved to another screen

[Tejesh R]

On Fri, 2 Jun 2023 16:26:29 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> When a frame is dragged from one screen to another screen, the `GraphicsConfigurations` may vary depending on screen/monitor. However, transparency has to be maintained since it is expected as it is set. So the fix addresses in maintaining the translucency capability when frame is moved from one screen to another screen. For main screen, translucency is set when `setBackground` is called, but for second screen the same is not taken care. Hence setting of Translucency Capable `GC` is taken care when screen switch happens. The fix handles only for non-opaque windows alone retaining the behavior for opaque windows. 
>> The fix is verified in CI for regression check, which is Green.
>
> test/jdk/java/awt/Window/MultiscreenTransparencyTest.java line 43:
> 
>> 41:  * @bug 8006421
>> 42:  * @key headful
>> 43:  * @requires (os.family == "linux")
> 
> Does this have to be linux only? Can't this be a generic test?

The fix is specifically for linux ( XWindowPeer).

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PR Review Comment: https://git.openjdk.org/jdk/pull/14246#discussion_r1217402478