RFR: JDK-8290469: Add new positioning options to PassFailJFrame test framework [v11]

[Harshitha Onkar]

On Tue, 23 Aug 2022 14:44:24 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> test/jdk/java/awt/regtesthelpers/PassFailJFrame.java line 268:
>> 
>>> 266:      * is null, only the instruction frame is positioned according to
>>> 267:      * {@code position} parameter. This method should be called before making
>>> 268:      * the test window visible.
>> 
>> Since this condition is documented, should we also implement check to handle it by calling isShowing() and throw some warning/exception if its visible.
>> We do the opposite for getLocationOnScreen() where we throw exception if the compoment is not showing.
>
>> Since this condition is documented, should we also implement check to handle it by calling isShowing() and throw some warning/exception if its visible. We do the opposite for getLocationOnScreen() where we throw exception if the compoment is not showing.
> 
> It's more like a recommendation rather than a requirement. It is to avoid flickering when the window gets displayed for a very short period of time at its default position before being moved to its final position.
> 
> The same had happened to the instruction frame before Harshitha moved `setVisible(true)`.

Yes, as described by @aivanov-jdk ,this was added to avoid flickering (happens when windows move from the initial to the final position).

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PR: https://git.openjdk.org/jdk/pull/9525